Long story short, my dad is getting old. He's now in his mid 70's, and still easily the meanest, angriest, most resentful old bastard you will ever meet. He's fiercely self reliant. Me and him don't always get along, and he doesn't really listen to much that I say.
Sounds like a moderator on OSA... But seriously, get his legal affairs in order now. No matter how much you have to fight with him and withstand the verbal abuse, you better do it now. Otherwise, he will be proven right and the .gov will get all of his Chit and you will still have the paperwork mess to deal with. You can't really make him care about himself, but you can make the end easier on you and your sister.