investigators say that on the night lisa stasi disappeared, john robinson gave baby tiffany to donald robinsone children of their own, the couple says they were overjoyed with their new baby girl and had no idea john robinson had orchestrated an illegal adoption. >> the john robinson that don knew was a caring, nice brother. the john robinson that is coming out now is not at all the john robinson that don knew. >> don never saw his brother be violent? >> don never saw his brother be violent. don never saw a dark side to his brother, john. >> did donald robinson and his wife think they were doing anything wrong when they took this child into their lives? >> absolutely not. quite the contrary. they thought they were starting a new journey in their life and providing a life for someone who had no family available. >> their lawyers say donald robinson and his wife, freida, raised tiffany as their only child, providing a loving home and believing exactly what john robinson told them, that tiffany's mother had committed suicide. but before tiffany turned 18 in september 2002, questions were raised a