[Crowbob]

There sounds like a certain inevitability to the worst case scenario playing out in this. As such, the man is going to be left destitute or die. Were I a member of his caring family, I would pursue some kind of mechanism whereby the man's care and well-being are provided for no matter what, if he doesn't die first.

When the woman burns through his estate and takes everything that's left at least he will be cared for. Maybe try to convince him somehow to set aside some of his money now, in secret from the new flame.

This is a tough thing to watch, I bet.