Would you be upset?

Would you be upset if someone didn't invite you somewhere because you have a 1 year old? My siblings and I have been dying to see a certain movie that just came out. However, one of our older siblings have a 1 year old child. He cries non-stop for no reason so I don't think bringing him along is the right idea. My brother is arguing because we are leaving him alone with his son and he's acting like we don't want to spend time with him or his son. Should we just stop our plans that we made because he and his son are here?

*That's the thing. He doesn't even WANT to see the movie. He thinks it's a childish movie. He expects us to stop our lives to attend to his son.