Boy I think that holidays bring out the rudeness in the family. I certainly had my share of them this weekend. Not my FIL but my DH's brother. I am so mad, I don't want to visit them for a long time.
First of all, I would have handled this a little differently. Since your MIL has mobility issues and could not watch Polar Express in another room, it makes sense that the movie would be watched in the family room. I would have warned your DH an hour before that this event would happen and could he and his dad watch the football game somewhere else. The problem and it's not your problem is that the game was really exciting and I'm sure once people were invested in the game, they didn't want it to be turned off. If you had warned your DH, he could explain to his Dad, hey dad, mom and the kids really want to watch this movie. How about we go down to the basement and watch the game down there.
Now your FIL was being an a**, yes, but it really ticks people off when they are into something and poof!, someone changes everything.
Now on to my problem! LOL! We drove 6 hours so that my kids could visit with their cousins. On Saturday my BIL decided to take his kids skiing. He didn't ask what we wanted to do but I guess my kids could have gone skiing with them. It would have cost me $200 for my kids to go and a month before x-mas I don't have the money. So we sat at my BIL's house while he and his family left on the only full day that we were there. When I complained to my DH, I was in the wrong. I didn't have to be asked what I and my family wanted to do after we drove 6 hours. I should have gone into debt to have my kids do something they don't even want to do and I'm an a** for even thinking that it was rude.
Yea men don't want you to diss them. It's a man rule. They can be rude and thoughtless but hey, they're family and don't criticize them.