i think what i have decided to do is keep my mouth shut, keep a journal so I have a fact based argument (as opposed to "alternative facts" which have been defined in my family as anything you can get one other person to agree with), and cook.
I'm a good cook. I will fill their freezer with edible microwavable individually packed meals.
When I'm gone I will still be there when they eat my food.
I don't think I'll go back until one of them passes. It's SO hard on me, and in turn my husband and my family. I've got the rug in front of my chair memorized from staring into space.