One should not hesitate to attempt to obtain a conservatorship if they can when this happens. It’s the only thing that will stop someone from losing it all. Unfortunately, if a court deems them mentally fit, there’s nothing to stop them.

The bar to get that done seemed too high before he lost all of his money. Now that's done there isn't much of a point, apart from protecting his house. My mom is on the deed as well so there shouldn't be too much risk there, though I've tried to convince her to put it into a trust for multiple reasons.

Recommend setting up deed monitoring/property alerts if your local property records/recorder supports it, should notify you if any documents are recorded or transfers attempted without your knowledge against the property.

Sorry for your loss.