My husbands biological father was listed on his birth certificate at birth. After the father died the mom remarried allowing the new husband to adopt her children. They divorced two years later. Mother started using biological fathers name for herself and the children, but did not go through the process to change the information in vital records. Besides the 2 years of the marriage, his whole life he's gone by his biological father's name. Now at almost 40 we went to get a replacement birth certificate, and his name and father are still under the adoptive father he hasn't had a relationship with since he was 15. He wants his biological father to be the name on his birth certificate. I can find laws to back up the name change, but not the father listing on the birth certificate. Will this be a difficult, or impossible process?