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Given this description, I think I would bring hard liquor, and lots of it.
I am actually serious--my grandmother behaves similarly, it never ends with some personalities. 87 years old and she throws tantrums when things aren't to her liking. So for my grandfather's birthday, I went to the liquor store and stocked the bar. Honey, you would not BELIEVE how many people, upon arriving, went straight to the hard liquor, knowing what the evening was going to be like. My grandmother, upon finding out that suddenly everyone at the birthday party was too sloshed to care about her whining and yelling, amazingly did not throw her usual all-out tantrum hissyfit. I suspect she realized she would only have been laughed at. It was awesome. I highly recommend it, make SIL the designated driver and babysitter (hey, she wants to be responsible for everything, let her wear herself out with it) and let everyone else have fun around her.
I am almost 100% in favor of the bar setup, as long as no drunk drivers hit the road. My mother was a big tantrum thrower, and it was her way or no way. We all brought beer, wine, booze whatever we needed to self-medicate.
One year I got her to drink a thimblefull of sherry- it was the best Christmas we ever had! (I told her that Queen Elizabeth always did it for the holidays.)
I do like the pasta salad/potato salad/cole slaw idea- they are all great with sandwiches, and no toaster oven required. Good luck hon, and have a Merry Christmas anyway!
And find an independent babysitter- you all should get a night out!