. >> researching her documentary, lori shineski, now a consultant for abc news, dug up life-changing surprises, including a stunning secret about which even at age 48, sharon had no clue. lori called sharon's adoptive mother. >> then my mother calls me and says, some lady just called me to say, you know, she is doing a documentary and that you have an identical twin sister. and i said, excuse me? and i hung up the phone. >> are you serious? >> and i was in shock. i just couldn't -- it took me hours to call her back to say, all right, what's going on? >> she was never told you were a twin? >> nope. i feel like she was so betrayed, and that just hurt me. >> would she have adopted twins? >> she said she would have, definitely. >> still ahead, the search for sharon and howard's missing twins, and disturbing childhood memories of strangers in the house. >> we never understood why they were really coming. it was weird, and i hated it. >> like, this is not cool. >> stay with us. (vo) we came here for the friends. and we got to know the friends of our friends. and we found others st like us.