Patience is a virtue
Dealing with the mentally insane/unstable/senile requires truckloads of patience. And I mean a big truck, not a small Datsun. Just when you think you're home free, quiet, time to get stuff done, they find their way to you to harass/harangue/annoy/test/try you yet again with the same questions they asked you earlier. It's OK, I'm sane, I can deal with it. I can't help it and neither can they.