Mine is a bit more comedy bad
We spent the first Christmas after my in laws divorce with MIL in our early childless days because we had agreed to alternate Christmas with each other's families after getting married.
MIL never gets anything fixed in her house. She always felt FIL should do it but he never did and then he left her. Therefore there were no functioning lights in the whole downstairs and we had to take a torch to use the toilet. The house was dark, cold, a bit damp and covered in a light coating of dog hair from her 3 dogs
We woke up on Christmas morning to the sound of teen SIL's pet rabbit being eaten by a fox. We rushed it to the vet as it was still alive but it had to be put down as it was so badly injured. No one felt much like opening stockings after that
MIL is not a person who cooks. She usually heats up Waitrose ready meals in the microwave but she somehow felt she had to try to do the whole works. She put the sprouts on to boil in the morning so the whole house smelt of them all day and they were horribly mushy. The oven hadn't been used or cleaned for a long time so when she tried to cook the turkey in it the kitchen filled with acrid black smoke. The oven door was broken and you had to hold it open with your foot to get anything out and risk getting burnt in the process. Then it transpired the only kitchen knife in the whole place was a cheese knife so DH had to try to carve the turkey with that.
What with those factors and the rabbit we didn't sit down to eat until late afternoon and it was definitely not enjoyable
The dinner table conversation defaulted to MIL complaining bitterly about FIL and OW and lamenting what they might be doing today, what might have been and his general shit behaviour. I had great sympathy but Festive and cheery
It was not.
Older teen BIL was in a horrible phase of life and angry about his dad leaving. He stayed in his room all day with his girlfriend like the ghost at the feast. They shouted abuse through the door when MIL tried to take presents or food up which made her cry.
The whole thing was made worse by the fact it was my first Christmas away from my huge lovely, happy extended family. My dad is an amazing cook, my parents have a big country house with an open fire and generally they give good Christmas. When they FaceTimed me to say Happy Christmas I nearly burst into tears.
After that I told DH that the alternating Christmas deal was rescinded and we always go to my parents and have MIL to stay at New Year (well we did until bloody Covid ruined everything).