Where is the limit to what an NParent/person will do?

I'm so past my limit today. My Nfather (NF) comes from a whole family of disfunction. And every time i think he's achieved the limit of what he's capable of he proves me wrong.

He bought a new, luxurious car. Today was the delivery. I'm beyond appalled. Its a big car, so my mother who is short, has trouble with balance and muscle strength as well as dementia needs help getting in and out. She's unable to communicate effectively on most days and has lost most of her executive function. So she's not even going to be able to complain about it properly. He insisted my kid (the golden child) and both me and spouse (the scapegoats) should be there. On practically no notice. We made it work for the kid.

And then he goes on to have merry little conversations with all the people he regals with his stories in his gated community to the point of not even caring that his precious grandkid wanted to go home.

At one point he 'jokingly' tells people that "he's bought a car for his son-in-law". Important here is that we are in a country that has a real problem with dowry and related abuse of women and their families. I won't blame my husband if he wants to have nothing to do with the man.... the implication is just terrible. All to look like the wonderful old man.