I agree that you should stay out of it. I've even said those words in family situations, "Sorry, I'm out of this one!" It's a no win situation because neither will see the other's side. Your MIL wants her son there every year, but having everybody together for the past ten years is really good. My mom hasn't had that. Neither has my MIL. Your SIL could try to find a middle ground, but if the whole family hates her and talks about her, she may just not care at this point. That's how I would feel if my in laws were doing that. They could eat without us for all eternity! The best thing for you to do is get out of the way and let them fight it out. Unless it's going to completely ruin your holiday. In that case, I'd ask them to please act like adults for one day for the sake of a peaceful holiday. They can fight on Black Friday while you go shopping!
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