So is the *parent*, father in this case, the husband (BHO Sr.) of the mother (Stanley Ann) or the sperm donor (FMD)?
In all states, AFAIK, the legal father of the child is the mother’s husband. Even if it’s not possible for him to be the biological father. Even if DNA evidence proves he isn’t.
The law doesn’t care. Trying to “prove” Obama isn’t the biological offspring of Obama Sr. is legally quite irrelevant.