I'm asking if you live with your dad because I think thats an important part of the situation.
For me, when my dad got remarried, I accepted it.
I tried to stay living with him (I was underage) & be happy but it wasn't a healthy environment for me.
So I moved. And I don't go to family functions with that side of the family. Because it isn't healthy for me.

Just because I accept it doesn't mean I want to be a part of it.