Who is the father?
The governing law on paternity -- including DNA testing, legitimation requirements to establish visitation and custody, establishing a father's identify to receive child support and so forth -- is decidedly state law, with processes and requirements varied among jurisdictions and unique to each state.
We were recently asked a Paternity and Legitimation question. A Paternity action is when a father brings an action to enforce his rights to visit with a child. A Legitimation action is an action brought by a mother to make the father the legitimate legal father of the child so that the child can inherit from the father and the father will be responsible to provide child support for the child.