they told me that i was abandoned at the hospital. and i could not believe it. this story, this is crazy. >> tonight, a condition so rare and mysterious, it's almost unheard-of. a bizarre medical disorder, denying you're pregnant, and then abandoning your babies. >> but what caused a different mother to abandon her newborn? >> there was a baby found inside the salvation army drop box. the box you were found in. >> both sought out to find their birth mothers. >> here tonight, a dna

detective. >> you're back to where it all started. >> taking them on the search of a lifetime. >> that's all we have to go by. your dna and the location you were found. >> the brand-new leads and blind alleys. >> i don't want to give you any false hope. this is a longshot. >> the setbacks, the rejections. >> she hung up on me. >> i thought maybe somebody was thinking of me, and where i was. >> the surprise of something they never saw coming. >> and i saw this. i had the same reaction. >> and the biggest shock of all. who is waiting behind that door? >> it's a big secret. >> thanks for joining us. i'm david muir. >> and i'm amy robach. this is "20/20." reporting here tonight, deborah roberts. >> who am i? where am i from? >> i was abandoned at a

hospital. >> i just wanted to know why. >> there's this feeling of not being wanted. >> i just thought i would never really know. >> a small, scenic town on a lake nestled in the mountains in idaho. its name originating from a native american tribe who call themselves the discovered people. while some are discovered here, others are lost. our first mystery begins in 1987, at this hospital. a pregnant woman checks herself in, alone, in labor, and carrying no luggage or personal items. >> she said she was in california, visiting some friends in idaho. 5'5", brown eyes. they said she was attractive but

uptight. >> at 6:30 a.m., she's moved to the birthing room. >> she gave birth to a healthy baby girl. good size, full term. >> after a short time, the mom does something inexplicable. >> she disappeared 12 hours later. she just left the hospital gown on the bed and that was it. >> she just walked out? >> just gone. >> mystified, the nurses give the now abandoned girl a nickname. >> they named her baby girl beach. which is pretty cute. one of the better names for forr foundling. >> this foundling is later adopted by a couple from idaho. >> this was a dream we had had for so long. when they brought her out, here came this little baby, this beautiful little girl.

>> santa brought this for me? >> they're a loving family, naming the new little girl andrea. she enjoyed piano, swimming, gymnastics. flash forward 31 years, she's now living in colorado and works as an office manager. she has no idea of the strange circumstances around her birth until age 16. >> they told me i was abandoned at the hospital. and i could not believe it. this story is, this is crazy. >> a crazy mystery she feels compelled to solve. >> you have a tattoo. >> i do. >> what does it say? >> it says baby girl beach. >> that was sort of your identity in the beginning. >> right. >> you're living a pretty happy life. you have lovely parents. why do you need to go looking if you're happy where you are? >> there's always going to be

void you don't know about. i just have always wanted to meet whoever she was. >> that she, the mother who walked out on her hours after her birth, was now the center of andrea's quest. >> i was born on april 7th, 1987. >> she posts a photo on facebook, holding a sign outlining her story. >> i was abandoned at a hospital in idaho by a woman named amy beach. please like and share. >> the post goes viral. >> her birth made headlines after her mother disappeared from the hospital. >> trying to be reconnected with her birth mother. >> many documeadopted kids have sense of yearning. how different is it for f lin foundlings? >> it's like their life began the moment they were found.

>> 2,400 miles away in another foundling mystery. another runaway mother abandons her baby. it's a cool summer evening in 1986. at sundown, a newborn boy is found, in a cardboard box next to a salvation army bin. >> two boys were riding their bikes, and found a live baby in a box. and they scooped the baby up, and i guess literally cycled home to their house with it in their arms. >> hours before, bystanders recalled seeing a pregnant woman nearby. >> they saw a very pregnant lady standing near the bin. haven't given it much thought, but then they started watching

the news, and heard that a baby had been abandoned there. >> a police sketch is published, looking for the mystery woman who left the baby. and like andrea, this baby boy doe is also adopted into a loving home. he grows up in idaho, being raised with sisters. flash forward 31 years later. that baby is now benjamin. a soldier in the idaho army national guard. deployed twice to iraq. how did you learn you were adopted? >> my 11th birthday, my dad told me. >> how did it hit you? >> i didn't believe him at first. then i was devastated. they brought the newspaper clippings. i was spinning. like, this is all a joke, right? this was the biggest question in my life. who am i, where am i from? i would look up at the stars and

wonder if my mom, dad, brothers, sister, or grandparents were looking at the stars that night. >> ben is on the biggest and most personal mission to date. trying to solve the mystery of his birth. like andrea, he's put his faith in one woman, c.c. moore. a world-renowned dna detective, whose work recently grabbed nationwide attention. leading to arrests in a number of cold cases. >> the same technique authorities used to arrest the suspected golden state killer. >> i've worked with dozens, maybe hundreds of foundlings by now. and so i know this is a really intense process for them. >> still ahead, andrea is about to find out some secrets get buried for a reason. >> you may have this idea that you're going to find birth

parents who will readily accept you. but that may not be the case. >> and a stunning discovery for ben. >> and i saw this. >> stay with us.

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searching topped the charts. ♪ >> reporter: and an abandoned baby is the storyline in the number one movie "three men and a baby." >> i'm not picking it up. >> reporter: where roommates discover an infant left on their doorstep. it was also the year that andrea was abandoned in real life at this hospital in coeur d'alene, idaho. now, she and cece are retracing the steps of the mom who left her, hoping to find clues that might unlock the mystery. >> you're back to where it all started. >> so, a lot's changed since 1987. >> this is one of our postpartum rooms which actually is similar to what it was back in 1987. >> i wonder how much time she spent with you. >> at least she was good enough to come in and have you in a hospital.

>> the feelings that she could have had, i can't even imagine. >> not that she's a hero, but it took a lot of courage to come in. >> it was a criminal offense to leave a baby somewhere. now, fortunately, safe haven laws have been created where women can take a baby to a safe place like a fire department, hospital, and they won't be prosecuted. >> reporter: a barren hospital room offering no answers for andrea. then, suddenly, an unexpected emissary from her past. this nurse, the same nurse who 31 years ago cared for andrea as an abandoned infant, kim beckman remembers trying to fill the void left by the baby's vanished mom. >> i remember holding you a lot. i worked evenings -- and rocking you and just wanting you to feel loved, and that's all i remember. i just remember how cute you

were and wondering how desperate that mom must have been. i hope you find your birth mom. >> reporter: sadly, clues are hard to come by in the maternity ward. with the exception of one. andrea's mother left behind an admission form. and on it, next to andrea's baby footprints -- her mother's fingerprint. was that significant for you? >> well, it was certainly a clue and it was the only clue we had. and so we did want to follow up on that. >> reporter: hopes pinned on this single fingerprint. andrea and cece enlist the nearby police department for help. >> i'm scott hogg. i'm the chief here in post falls. >> nice to meet you. >> very nice to meet you too. so let's see what you got here as far as the fingerprints go. the name that was used was last name of beach? >> uh-huh. >> okay, are you comfortable that she simply walked away on her own, that there was no foul play, any of that type of activity that may have occurred? >> i don't know if there was any foul play, i don't know. >> i don't want to give you any

false hope because this is a long shot, and i'll get in touch with you as soon as i hear something back. >> i feel like this is a puzzle that we're trying to put together, but all the pieces are face down on the table. >> reporter: like andrea, ben tveigt, also abandoned at birth, is determined to find his biological mom. >> so right now we're heading to cece moore's house. >> hello. >> hi. >> come on in. >> i'm ben. >> hi, it's really nice to meet you. >> likewise. >> all right, come on in. >> i have some news. some things to show you. >> reporter: cece has taken ben's dna and entered it into four national databases, hoping for a match to his biological mother. with possible hits on distant relatives, the dna detective's got her work cut out for her. >> it's going to be difficult -- >> reporter: then, she catches a break -- a direct hit on someone they weren't even looking for. >> i logged into your match list a couple of days ago, and i saw

this, r.b. is your father. >> reporter: ben does an actual double take. >> i had the same reaction. >> how did the planets align perfectly for that to happen? >> it's a man named richard blanshfield, who's a pretty incredible guy. he's a vietnam vet and he's not just any vietnam vet, he's a highly decorated vietnam vet. >> reporter: what are the odds? ben, a veteran of two tours in iraq, learning his biological father is a war hero. >> his arm was nearly blown off at the shoulder. he was 47 years old at the time of your birth. >> is he still alive? >> he is still alive. here's the good news, your dad lives 20 minutes from here. he just happens to live down the freeway. >> reporter: did you believe this? >> i thought i got struck by lightning when she told me. to find a relative that close, it blew my mind.

>> reporter: up next -- ben's visit, face to face with a father he never knew. >> i'm trying to regulate my breathing, i'm trying to be calm. >> okay, let's do it. >> i knock on the door and there's this voice -- >> someone knocking on my door? >> reporter: and cece hits paydirt with andrea. >> and when i opened it, i had quite a surprise. >> i thought, "wow, this actually worked." i just couldn't even get on a plane fast enough to go meet her. >> reporter: stay with us.

>> reporter: as a sergeant in the idaho national guard, ben tveigt has tested his mettle and grit as part of the perilous u.s.-led invasion in iraq. he's an experienced gunner on one of the most powerful tanks on the planet.

>> we're driving to my dad's house. >> reporter: but now ben has to muster all the courage he has for a deeply personal mission. >> i am terrified and excited all at the same time. >> in 800 feet, turn right -- >> the longest 800 feet of my life. >> reporter: genealogist cece moore joins him at a house in southern california where ben's birth father lives. >> you ready? >> i'm ready. >> give me a hug. i know your father is very excited to meet you. >> i'm trying to regulate my breathing, trying to be calm and not look like an idiot. >> let's do it. >> i knock on the door and there is this voice. >> somebody knocking at my door? >> hello. >> hello, you must be ben. >> i'm ben. >> i'm doc. wow. how you doing? >> this is eerie. >> you bet it's eerie.

come on in, son. come on in. welcome. welcome. >> and i was just overwhelmed. i didn't even know what to say. >> did you feel a connection? >> yeah, right away. right away. >> come on in here. this is the room i love the most. >> reporter: his biological dad richard or doc blanchfield recipient of the purple heart, shares keepsakes from a rich life lived. >> see the pictures on the wall? >> mm-hmm. >> vietnam vet, 82nd airborne. >> reporter: the two, startled by the similarities in their lives. >> you went in the army, you were 18? >> i was 18 years old. >> so same as i did. i went to the marine corps at 18. >> reporter: what if anything does he remember about ben's birth mom? doc recalls a night 32 years ago in anchorage, alaska. as a single dad he had a chance encounter at a bar called the cabin tavern. >> and there was a young lady sitting at the bar. i just went up and sat down. didn't say anything. i had my beer. we started a conversation. she was in a difficult relationship.

but i took a liking to her, i really did, she didn't want to go back wherever she came from. i don't remember the lady's name, honest to god i don't. >> reporter: he recalls making dinner for the woman. and the two sharing a tender, romantic night. >> before she left, i remember this distinctly, i had three statues, i still have two of them, they're from china, and it was a chinese goddess statue and i gave it to her and i said, "this will bring you good luck." i never heard from her again. i wonder if she still has it. and here's sean, my other boy. >> these are my brothers? >> yup. >> reporter: then, a revelation of relief. doc says he would've kept his son if he'd known he existed. >> there was that feeling of rejection that i had for so many years being abandoned, and it counterbalanced that feeling because i was accepted and i was wanted, it lifted a weight off my shoulders, off my chest. i couldn't go to bed angry anymore.

>> reporter: as a parting gift, doc offers his newly found son a note. it says "we are family" and the marine coda "semper fi," always loyal. meanwhile, andrea's identity search has hit a snag. she had been so hopeful after offering to police that fingerprint from her birth mom. and did they find anything? >> no. i mean, it would have been great to get the identity, but had her fingerprints been in the system, that probably wouldn't have been a very positive indicator. >> reporter: usually it's associated with crime. >> if they've been arrested, we didn't want to believe that she went on to live a life of crime either. >> place three swabs. >> reporter: but where old-fashioned forensics have failed, some high-tech dna sleuthing by genealogist cece moore has come up with a startling match. >> this is your match list. and when i opened it, i had quite a surprise. if you share both parents, you would have big blocks of green. so how much green do you see? >> there's a lot of green. >> do you know what that means? >> that we could be siblings?

>> you're not just siblings, you are full siblings. >> whoa, that is so crazy. >> you share the same mom, and the same dad. >> reporter: and suddenly you realize you've got a sister. for somebody who's not even really expecting much and you're seeing this now. >> i thought, wow, this actually worked, i found something. i just couldn't even get on a plane fast enough to go meet her. >> reporter: wasting no time, andrea leaves colorado for wisconsin. >> i'm nervous to meet a stranger that just happens to be my sister. i was so nervous for her to open the door. i just didn't know what to expect. hi. >> hello. >> how are you? >> good. how are you? >> reporter: at first, andrea and her sister heather are reeling from a combination of awkwardness and a deep bond. >> i just knew immediately that we were both really shy and kind of awkward and she just

immediately told me that she had a bunch of information about our biological family. >> that's my adoptive mom. >> reporter: heather was adopted in washington, a state that allows access to adoption records. so she already knows the names of their birth mom and dad. >> our birth mom's name is deirdre, she went by cindy. this is our mom. >> oh, my gosh. wow. >> reporter: after years of searching the moment has finally come. andrea is about to learn about her origins, but the truth will be difficult. >> she had a baby boy two years after you. >> oh, my god. >> and the baby and her passed away. >> oh, my god, oh, that is so sad. i am really glad to find all this out.

when i heard that news i just -- it took over. i just couldn't even -- i just came to a stop. i -- i will never be able to meet her. >> reporter: and to hear this from your sister who you just met. >> yeah, it was sad. and all this time i thought maybe somebody was thinking about me and where -- where i was, but she hadn't. it feels like i just lost somebody that i didn't even know. >> reporter: and there's an astonishing twist in her family saga. while andrea and heather were given up, their mother and father kept and raised two sons. >> the boys were raised by our mother and father. >> reporter: why were they raised by your biological parents and you weren't? >> yeah, so we had a lot of questions. this dimple, yeah. totally. >> reporter: next -- andrea starting her journey alone, now paired with her

sister. together they will travel to meet their two brothers and their father. >> oh, boy. >> reporter: and confront a deep family secret. a mysterious notation on their mom's death certificate. >> it was no normal death certificate, not what you would expect. >> reporter: stay with us.

♪ do you recall, not long ago ♪ we would walk on the sidewalk ♪

♪ all around the wind blows ♪ we would only hold on to let go ♪ ♪ blow a kiss into the sun ♪ we need someone to lean on ♪ blow a kiss into the sun ♪ we needed somebody to lean on ♪ ♪ ♪ ♪ all we need is someone to lean on ♪

>> reporter: andrea klug-napier has discovered a sister, and together they're going to meet two brothers they never even knew they had. >> super nvous, i kind of have a stomach ache.

>> reporter: and someone else, their biological dad. >> oh, boy. >> reporter: with their mother gone, they hope their father holds the key to their looming question. why would a mom and dad forsake their two daughters, but not their sons? >> hi. how's it going? >> good. >> hi. >> i'm aaron. >> i'm andrea. >> hi. >> nice to meet you. >> reporter: finally, face to face with brother aaron who answers the door and then their father dwight. the new family finding their footing as dennis, another brother, joins them. >> have some flowers. >> thank you. >> reporter: so you were meeting your biological father and your two brothers that you never had any idea existed? >> i can't even describe the feeling. it was crazy. the article that they had in the newspaper, the nurses described her as uptight and attractive. that's what it says.

>> really? >> dwight just immediately started talking to us and telling us everything that he knew about our mother. we just wanted to see every picture that was ever taken of her. >> this picture of her reminds me so much of heather. >> you guys look like mom big time. >> yeah, yeah. >> reporter: dierdre, who went by the name of cindy, was only 16. and dwight, 17, when they married. she later worked as a computer programmer. and then he told you about the day she died. >> yeah. >> it was like 20 below here, and the weather was bad. the city was shut down. and she told me she had the flu. >> he told us that she had been ill, and that he left for work and that when he got home she was unconscious. >> i called 911. >> reporter: and what happened? >> well, they come and took her to the hospital and went to the hospital and they pronounced her

dead. all the doctor said was that she was really torn up inside. it wasn't till i went home and it was couple of days later, i went to the bedroom door was locked. there was a baby sitting on the bed. full-term baby. >> reporter: an unimaginable discovery. the death of a baby boy he hadn't even known he fathered. >> i thought i knew her, i thought everything was great. >> reporter: but what about andrea and heather? incredibly, dwight says he had no idea his wife gave birth to them either. >> and that's the story. >> yeah. >> it was pretty brutal. >> i thought at first i'm for sure going to see something in dwight that maybe he did know and he's hiding it from us. but immediately when we sat down, he started talking.

i knew that there was absolutely no way that he knew about us. she hid everything from him. >> reporter: most people would look at this and say, how could this be? how could your wife give birth and you have no idea? >> i still question it myself today, wondering, how did i miss it? >> reporter: he says when cindy was pregnant with their sons aaron and dennis, she barely showed. >> her stomach wasn't big at all. it seemed like she gained a little weight through the face. >> reporter: you are living together in the same house, you're sleeping together in the same bed. you must have seen her disrobe. >> i thought it was maybe weight gain or something. >> reporter: you never recall her looking pregnant? >> no, not ever. >> reporter: how is it possible that his wife could give birth and he knew nothing about it? >> i've worked with families, people always question how could no one know? how could you hide a nine-month pregnant belly? but women do it all the time. >> reporter: the sisters, still

reeling from it all, visit their mom's grave to say good-bye. still confounded by why she hid those pregnancies. the answer may lie in a strange notation on cindy's death certificate. "unattended birth associated with psychotic denial." had you heard of that before? >> i have seen it in other cases. that's not terribly unusual in foundling cases, where somebody denies they're pregnant until it's too late and they haven't made any sort of arrangements. it's probably one of the reasons that some people get abandoned rather than legally adopted. >> denial of pregnancy is a recognized psychiatric or psychological condition. >> reporter: psychiatrist susan hatters-friedman has studied the disorder and says it's surprisingly common. 1 in 400 women may suffer from some form. >> the woman may have some idea that she's pregnant intellectually but she pushes it from her mind. until she can no longer do so, because she's suddenly giving birth. and certainly, a young woman's

own experiences of abandonment could contribute to denial of pregnancy. >> reporter: possibly explaining cindy's odd behavior is a painful backstory. as a small child, cindy and her sister were both given up for adoption. they were on a bus, en route to an orphanage. >> and at the last minute, their brother pulled her sister off the bus and left her. >> reporter: left cindy. >> alone. >> reporter: by herself. >> she's just a little girl, almost 3 years old, on this bus alone, who's sent off to some orphanage. >> reporter: must have been traumatic for this child. >> it's abandonment again. but we only can speculate what sort of emotional damage that may have done to cindy very early on in her life. >> reporter: still ahead, andrea and heather, about to find out their mother took even more secrets to her grave. and ben's search for his mother has been narrowed down to two women, one of them on the other end of this call.

the moment of truth. >> by my experience, the dna doesn't lie.

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>> reporter: anchorage, alaska, known as the last frontier. and for ben tveidt, it is the final step in finding the missing link to his past. desperate to connect the dots, ben makes a stop at the anchorage police station. >> hi. >> i'm dave cook. >> dave, nice to meet you. >> reporter: believe it or not, he locates the detective who was one of the first on the scene three decades earlier. >> you didn't have any physical trauma, anything like that. the umbilical cord was tied up with a sandwich tie. >> reporter: their most promising lead, that police sketch of a possible suspect, never got an i.d. >> there were several possible prints, but they were poor and not very useful. >> if fingerprints were lifted, would they have been preserved? >> we're talking 30 years now. >> right. >> and basically all the photos have been destroyed, the prints have been destroyed. >> reporter: and yet again,

old-school crime solving is futile, leaving it for cutting edge dna technology to save the day. but genealogist cece moore's been able to identify two of ben's second cousins. she traces their family trees all the way to their great grandparents. then builds the family trees forward with their descendants. poring over obituaries, gravesite locators, and census records, she pared it down to two women. sisters. one who would be ben's aunt, and the other would be his mother. >> how certain did you feel that you had the right two women that probably would wind up being his mother? >> oh, i -- i felt completely certain that i had the right two women. because of the way the family trees came together, there was just no other explanation. >> reporter: for ben, the meteoric moment is here. >> i'm going to see if she's willing to talk to me. i've been less nervous doing operations in baghdad than i am right now. >> reporter: unannounced, ben's rolling the dice, pulling into the office building where one of the sisters works, certain she's

either his aunt or his biological mother. tell me what your feeling is. you're dialing that number and you're waiting. >> the keys on the phone felt pretty heavy as i was pushing them. here we go. >> hi. my name is ben tveidt. i have been put in touch with you by some people of mutual acquaintance. i'm looking for some long-lost family members. >> reporter: so she answers. >> i hear the voice. a middle-aged woman's voice, and it was a little standoffish as at first, trying to figure out who i was. >> reporter: the startled woman on the other end of the line immediately denies that she or her sister could possibly be ben's mother. >> the only reason i'm so adamant about it is that the dna

brings us to a path that leads here. i'm not trying to be accusatorial. there's no malice or negativity on my end. i just -- i'm holding onto just a thread of hope. right now, that's all i have. >> reporter: it's devastatingly apparent that the woman, either his mother or his aunt, wants nothing to do with ben. >> i'm sorry for inconveniencing you this afternoon. bye. she's extremely adamant that her and her sister are a dead end, but people can lie. dna doesn't. i just don't know. crawling back inside myself, i'm starting to feel nothing again, which is okay. that will pass.

>> reporter: minutes later, though, a heart-stopping, paralyzing moment. ben's cell phone rings. could the woman have had a change of heart? instead, the woman's sister calling back, to tell ben to never contact them again. >> just out of curiosity -- she hung up on me. she said that i need to go back to where i'm from, and love my family, and love the people that raised me. >> reporter: so there was no warmth or no acceptance at all on this phone call? >> no, no. the meat and potatoes of the conversation were, i was messed up for coming and interfering with other people's lives and digging things up that shouldn't be dug up. >> reporter: did that lead you to believe that she probably was

your biological mom, or maybe not? the fact that she was so defensive. >> her reaction led me to the conclusion that she's probably the mother. >> reporter: do you feel rejected? >> yeah. it shouldn't have to go -- have that feeling twice. rejection, abandonment, not being wanted. a special kind of loneliness. i felt that loneliness again in the car. that wound is probably still open. >> reporter: for the adoptee, they want answers. but for the mothers, this is probably one of the most difficult things that they've ever had to deal with. >> when they get contact from their child, it really is opening pandora's box. they have to face a lot of deeply buried emotions. they've carried a lot of shame, a lot of guilt and fear. >> reporter: and a big secret. >> a big secret, and it could disrupt the lives that they've built since. >> reporter: ben reaches out to his adoptive father back in idaho. >> i told him if i had to go back in time and do it over again, i wouldn't change anybody

in my life. everything that i am is because of you guys. >> i don't know that if we created or just helped you along. you are a great person. you have a bigger family now. >> yeah. because the world has given me so much, and i was blind to that for 30 years now. it has never been so clear until now that i have never really been alone. >> all right, son, i love you. >> i love you too. >> reporter: next -- for andrea, the dark story of her mother's past is only beginning to unfold. you begin to suspect there are could be other children? >> i did. >> we knew there were five children already, but there was a 13-year gap between heather and andrea. >> reporter: are there more siblings possibly born during that gap? >> every two years on the clock

she is having babies.

>> reporter: andrea klug-napier's journey to find her biological family has taken emotional twists and turns she never could have imagined. her family tree, rapidly growing. >> i grew up an only child, and now i have so many siblings. >> reporter: she has three aaron, and dennis, and now incredibly, she's about to meet a fourth, a 32-year-old sister. >> heather just out of the blue sent me a message on facebook and said, "are you sitting

down?" and then i found out i have another sister. >> reporter: andrea has traveled to washington state and, once again, she is knocking on a stranger's door. >> hi. >> hi. >> oh, my gosh. >> it's so nice to meet you. >> we actually look a lot alike. >> can you believe all of this? >> no. >> i never thought that i would find anything out ever. >> reporter: her sister's name is marysia. her abandonment is remarkably similar to andrea's. birth mom cindy arrives at this hospital in spokane under an alias, gives birth, and then hours later vanishes. >> the name was fake. >> did you ever search that name? >> sandy davis, it is such a common name. >> same with amy beach. >> yeah, exactly. she said she is from california. >> reporter: the two sisters marvel at their mirroring stories and reflections. >> looking at her was so surreal to see these features that i see in myself everyday.

>> i think andrea and i did have a connection when we first saw each other. we're both hesitant and a little bit shy, and i think that actually, you know, helps us kind of understand each other a little bit more. >> reporter: and believe it or not, another stunning find. a fifth sibling. a 35-year-old brother that cindy gave birth to and abandoned at another hospital. another child that dwight never knew he fathered. it's one thing that you missed it one time. >> yeah. >> reporter: maybe two times. but to miss her pregnancy five times? >> yeah. right. >> reporter: that's really pretty stunning. >> i just couldn't, didn't know she was pregnant. couldn't tell. >> reporter: do you see them as your children? >> oh, yeah. yeah, they're my kids. >> good to see you again. >> reporter: andrea's search has led to an unforeseen family reunion. and for her adoptive mom, beverly, a chance to thank the man who brought her daughter into the world. >> thank you. >> you did a great job of raising her.

>> it takes nature and nurture. and together, we've produced a very beautiful young woman. we are part of her story. it's just a miracle that we have all found each over. >> reporter: as for ben tveidt, though the search for his birth mother ended with a harsh rejection, he rejoices in the discovery of a special man, a second father who embraces him fully. are you happy you set out on this journey? >> oh, yeah. i could go to my grave happy knowing all that i know now, some foundlings don't ever get that closure. i really feel that connection to another human being in this world. i'm thinking law school after. >> now we're talking. there is a future for you, ben. >> i value myself that much more after meeting him. >> reporter: in the case of andrea and ben, both sought out to find their birth mothers. >> right. >> best of the best.

>> reporter: both found birth fathers. >> yes, with open arms, yeah. >> oh, yeah. >> i always hope that there can be at least one connection to the biological family. somebody that welcomes them to and i've seen such closure and peace of mind come to these people that are searching when they get that. >> peace and closure, but there is definitely more to come on this, amy. >> and that's because andrea has yet to meet that fifth sibling that lives overseas. she hopes to meet him soon. that's it for us tonight. i'm amy robach. >> i'm david muir. from all of us here at "20/20" and abc news, thanks for watching. have a good evening and a great week. good night.

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