Child’s last name.

My daughter is 4 years old. She has her bio dads last name, however he isn’t on the birth certificate so legally, unless he takes me to court, he has no rights.

I’m now married to an amazing man who my daughter calls daddy. We have a son together and another on the way. She’s the only one with a different last name.

I don’t want to change it completely bc that would just cause a butt load of drama with her bio dads family but I’d like to at least hyphen it.

Has anyone done this or does anyone know the steps?