If the ACTUAL father would like to come forward, petition the court, submit his DNA and establish himself as the father (and the child support payment), then he is free to attempt to do so - or, since she's not sure which one the father is, she could petition the court to order both the date rapists to submit DNA. But I would assume that she's not ok with the idea of potentially co-parenting the child with either of these two men, right? They are the only potential persons whose DNA might have any legal relevence to the courts at this point. The court isn't now going to make the child a bastard until a new potential father comes along. The courts don't play musical birth certificates - once she put that name on there, it'll take a successful petition and actual DNA to change it. (And even valid DNA doesn't mean that the court would find it in the child's best interest to swap in "real" father - but for the sake of argument, if the court DID grant paternity to one of the rapists as the father, you DO understand that visitation or even custody could go along with that, right?). She chose to name this man the father, and for the child's sake, the courts aren't going to let her back out of it now - not unless she wants to ATTEMPT to get the child's REAL father to be identified and potentially involved.