When my wife and I first met... she had a son from a previous relationship. We've been together for over two years now and the father has never tried to make any contact with his son or my wife (not even her family). He has only met the little guy twice in his six years of life for a grand total of a few hours. As far as the boy is concerned... I am his daddy. His biological donor has a pretty long history of arrests for crimes he has committed. He has even done time (2yrs.) for sexual acts against minors. Currently he is a register sex offender. Also... his name is not on the birth certificate. Is there any way for him to suddenly appear and claim rights? Also, would it be difficult for him to get any type of custody since he has never been involved with his son's life and never spent a dime to support him? I just don't want this to tear apart this little guy's life... he is such a wonderful little boy and I consider him my own flesh and blood.