A friend's grandmother died, recently, in a nursing home that ought to have been closed down. She was perfectly rational, for most of her life, on all topics except religion. She gave most of her money to the local Christian television station. The family couldn't stop her. I wish you better luck.
When I get a Nigerian scam spam, I respond, explaining that my grandfather is a judge. (Well he was. He died when my father was 15.) I suggest that legal action will be taken. Somebody ought to do something about these spam scammers, if only because of the space they take up peoples' mailboxes.