Well, this just got more joyous. My brother called, in the interests of comparing thoughts, fears, and plans.
Turns out that nobody mentioned to me that Dad ALSO has a big cyst on his liver that will be removed at the same time. my brother also came up with the statistic that there's a 6% mortality rate during recuperation from something like this. Now, as I pointed out to him, 6% is low and there's a chance of all sorts of things when you operate but... oy.
And he thinks I should think less about what I want and more about the stress Mother is under, but the more I think about it, the more I like the suggestion that I bring the Christmas on. It gives me something to focus on and takes the pressure completely off Mother.