Just trying to imagine why he would have a hoe in his bedroom makes my head hurt.
Is there any history of Alzheimer's in his family? If so, you might be able to use his OCD to good effect by getting him to read a book called The End of Alzheimer's by Bredesen. It's a program that's been effective in reversing mild to moderate dementia, but if you could convince him to try it for prevention, it would probably also work for whatever is wrong with his brain right now.
