In a netshell, my Dad died on Friday, my dog was put to sleep yesterday, I have my kids in the morning on Christmas Day, then they’re going to my ex. Plan was always to go to my sister (and normally I love going there) to spend with her and her kids. But I just feel so miserable I think I just want to stay home and be alone. Obviously the family will be unhappy with this and they think it’s best to be with each other.
YABU - Suck it up and spend Christmas with your family, distractions will be good.
YANBU - Do want you want, stay home alone and don’t celebrate.