This probably sounds dumb, but I am assuming that I have sole custody. His biological father did not come to the states for his birth, he has never seen him or contributed to his upbringing financially or otherwise, and he was not required to sign his birth cert or other docs by the state that I live in. I am legally married to someone who is not his biological father, and in my state, where there is a presumptive paternity law, my husband is considered his legal father, not his biological father, because we were married when he was born. I am sure that federal trumps state law, but I haven;t looked into that yet.