Have you thought of having them come live with you?
No. My mother is a very negative, demanding, unforgiving woman. She has been treated like a queen by my dad and all she does is tell him he doesn't do enough for her. His 2 retirements (which equal far more than most people working in a year make) are not good enough, he should have done more to earn more. She was a stay-at-home-mom & never had to work a day of her married life.
She has been told over & over dad has dementia & she responds with, "he'd remember if he wanted to" or she "will make him remember."
Call us bad children, but we had to live with her tantrums growing up, and they are even worse now.