If they were living together at time of birth and he allowed his name to be on the birth certificate, provided care and support before and after the birth, it will be an uphill battle. His actions imply his acceptance. As an example, she could say he knew it wasn’t his baby but still wanted to be considered the father, as indicated by the BC.
Is there any other are of the law, where going forward because you believed a fraud means the person who committed the fraud is off the hook?
she can’t speak for him.