>> reporter: setting off a frantic search for the baby and the woman. >> she must have been desperate for a baby she wanted to take someone else's baby away from them. >> reporter: and nothing. 15 months later a toddler was found abandoned on the sidewalk in newark new jersey. they thought maybe it was the missing child. >> i said, oh, my god, that's my baby. >> reporter: and that should be the happy ending to the story. a family reunited or so they thought. >> i love my family. and my family upbringing. >> reporter: but paul could never shake the feeling that he didn't belong. and when he became a father himself. questions about his family's medical history spurred him into action, asking his parents to take a dna test. >> i can't believe it, i'm not