Dh and I got married recently. We've been together since dd was 2 and she hasn't seen her birth father since she was 4, she is 9 now. She knows dh isn't her biological father, but is her dad in every other sense.
She has asked if she can change her surname to dh's name. Problem is that we don't have any contact with her father, and I think he would be unlikely to agree even if we did contact him. I suggested to her that we could find out if she could double barrel it.
Do I need her father's permission to do this?