Ah, that's reminded me of something else. In my mum's case, I had this problem that she wouldn't or couldn't articulate what she needed, and would instead get crabby and hostile. I'd have to ask her "Are you hungry? Are you thirsty? Do you need the toilet?" etcetera in succession until she said...
I lost both my parents to dementia in 2017 and 2018, it was devastating. Two pieces of advice from bitter experience: Don't kid yourself that you can somehow pull them back to reality; there's no point correcting them when they remember things incorrectly, it'll only cause arguments and...