they brought him home to chicago and, for the second time, named him paul joseph fronczak.ents were convinced. why were they so convinced? >> i feel it's the fbi, the fbi is like the, the epitome of authority, and when they say this is your child, i would believe them. that's it. >> reporter: and that ended the search. >> yes. >> reporter: at that point. everyone stopped looking for paul fronczak, that was the end of the story? >> yes. >> reporter: tell me about your childhood. was it happy? >> yeah, it was a great childhood. barbecues, family get-togethers, family vacations. >> reporter: the family so often filmed in heartbreak, now recorded home movies of their own. the star of every celebration of course, was paul. they had missed his first step, first word, first birthday. but paul was now back where he belonged. blissfully unaware of his past until years later when you were 10 years old, you had a shocking discovery, tell me about it. >> i was looking for christmas presents, and snooping around the house, and i found all these boxes. and it turned out it was a box of c