AITA for skipping Christmas over the "no brining the dog" thing

Our family has a tradition of Christmas at one of our two grandparents' houses. My dad's parents just have a really hard time with money, but my mom's parents are well off and have a REALLY nice house. This year my dad was out of work for a couple of months due to covid, so my mom suggested just having Christmas at my dad's parents' house this year. She thought it would just be less of a burden on them to get everyone fed and then pay for gifts, and she knew it would mean a lot to them to still get to have Christmas at their house.<br><br>My brother and his wife live in another state, and they always come to visit right around Christmas because of my brother's job. They have a kid who's 2 years old right now, and they brought their dog along with them this year. My mom's parents have a cat, and they have a rule that pets aren't allowed at their house, and my brother's dog isn't extremely well trained.<br><br>My mom and dad argued about not bringing the dog to Christmas for pretty much the whole week, and my dad eventually said they could bring the dog.<br><br>Then my mom's parents called me and asked me if I was going to be coming to Christmas this year. I told them I was going with my parents, to my dad's parents house. My mom's parents told me not to worry about my parents, and that they were going to be preparing Christmas dinner and pretty much waiting for me to show up.<br><br>I told my mom about the call, and she got really upset. She told me that I was being immature and making my family angry, and I said it's not my fault that she wanted to go to the other side of the family.