Annoyed?

My boyfriend and I came to his moms to spend time and drop our daughter off so we could go on a little date. Well we got here and out of nowhere without asking me he asks his sister if she wants to go to the movies with us. Keep in mind he was JUST complaining about money in the car on our way here. I never get time away from our child and this was supposed to be our little date. Also, anytime I mention taking my nephew or niece to the movie it’s an issue and he just seems uninterested in doing so. But he jumps to it when we are at his moms. I’m just annoyed probably being childish but yeah. that’s just how i feel.