Unfortunately I might be able to give you some advice if you think a Nursing Home might be the solution.
Also is any dementia involved with either of your living parents?-Tom
He’s certainly not anywhere as mentally sharp as he used to be (was an engineer), forgets he’s told the same stories many times...so probably some level of dementia but you could still have a reasonable discussion.
I’m not sure they can afford a nursing home...but honestly I know little about those options & costs. Thoughts welcome.