I'm talking of Christmas in particular but it can relate to any occasion really where you all meet.
If so, do you all sit there telling amusing anecdotes or sit there with one eye on the door and the other on the clock?.
Having spent the last two Christmases without the dreaded rellies I can recommend this course of action (still can see MIL coming up to me in the kitchen with kids lunchboxed sized bottle of Evian water saying ,"this is for BIL". I ended up giving him tap water). That particular action along with a few others that day were the catalyst to not spending Christmas with them for the next two years but being abroad for the whole shooting match instead.