Child's last name
My sister has a 3 year old son. When she was pregnant the father left and moved to another state. He was not around the sign the Birth Certificate. So my nephew has my sister's last name. Recently the father has said he wants my newphew to change his last name so it is the same as his. My sister does not want to make this change and sees no reason for it. What is the chance that my nephew will have to change his last name from his mother's to his father's?