My 2 older dc (14 and 12) have nothing to do with their biological dad. He walked out of there lives 7 years ago.
Iv been with my Dh for 8 years. Dh does absolutely everything for them. Provides financially, emotionally & everything else. They absolutely adore him. Dd & Dh are literally best friends. They call him dad.
My sister refuses to call him dad because “he isn’t their dad”. So when she asks the kids something like “are they from mum and Tim” instead of mum and dad. It really upsets my dc.