Obviously got out of it last Christmas.
We're driving down to IL's Boxing Day morning (They live 3 hours from us)
SIL (who will be there with her husband and brood) and I don't get on, well I say don't get on, she hates me because I'm with her brother and any attention he or her family spend on me, is less attention on her and her children 
MIL is thick as thieves with SIL but pretends she likes me. It's always so fake, sly and vomit inducing. Will spend the day being nice one minute and then cold and making sly digs the next. Exhausting.
I just cannot be bothered.
I'll get through their front door after a long drive, probably hungover because y'know, Christmas the day before to MIL insisting I help her make the meal. The kitchen will be an absolute tip without any spare surface to actually prep any food on as she's an absolute calamity. The cat will be all over the small amount of available worksurfaces 