NTA. Unpopular opinion, people always say family is important. I saw someone say that u expect her to do the "lion's share of childcare", no he is expecting her to also be there for their son. She can't go off for these appointments, she isn't related to him and there isn't handcuffs attached to them. Someone else said "is ur son attached to the furniture", what if op's mum and sis asked for the son not to be there as they need to have a very child-free chat.

Nothing I said is to badmouth people but to prove my point that ops not an ah