Every year for the past 10 years I have hosted Xmas and cooked for 12+ people, my parents, sister and her family and my in-laws (DH is an only child) so that we are at home and everyone sees the kids and this has been fine. This year my parents hosted, cooked, bought most of the food, lots of effort. Again all of us together and invited my inlaws along. Had a good day and were there for about 9 hours. Today I find out my FIL (v quiet) left without saying thanks or goodbye to my parents, although I am sure MIL did. I am really annoyed by this. What do I do? I want to raise it with the in-laws and say I think it was rude but it could cause a falling out with them and upset DH.
DH doesn't know yet but I will tell him. He is unlikely to want to say anything for fear of rocking the boat but my immediate reaction is they can be on their own next bloody year then but then I am mean.
What do I do? I am fuming