Can you change the last name of a child if the other biological parent is unknown
My son was born when I was married to my previous husband. My ex-husband was thought to be the father and his name is on the birth certificate. After separating from my ex he performed a DNA test on my son and found that he was not the father. The father is unknown and does not know that my son was born. My new husband has become my son's father and wants my son to have his last name. How do we do this without the other biological parent or does that matter? In my divorce papers from my previous marriage it states that my ex is not the father of my son.