My hill to die on was the 1st Christmas with DD. She was 4 days old on Christmas Eve, and after an exhausting day of visiting with family, DH allowed his parents, sibs, and one sib's violent SO to invite themselves over, after 10pm, to open presents. Because "its the DHname family tradition!". Did I mention that we had seen them every day that week because we had a newborn?
They didn't leave until after midnight, and SIL had the nerve to say that I wasn't being a good hostess since I didn't have food ready or enough seats, and shouldn't I give up my seat for MIL? Maybe because I wasn't expecting to a. go into labor several weeks early and have the baby, b. have 7 extra people crammed into my living room which seated 6, and c. have them stay until after midnight because their traditions were more important than us getting to bed at a decent hour.
I told SIL that she was welcome to let her mom sit in her spot, but I wasn't moving from my seat since "I just had a baby. She's not even a week old, and they don't just crawl out on their own. But thanks for asking, I'm quite fine sitting right here."
Not my best moment, but again *4 days postpardum with a house full of demanding ILs after 10pm*.
I solved this by telling DH, "Never, ever again. I'm not hosting a gift swap in our tiny apartment, especially since SIL was rude to me in my own home."