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I am sorry to hear of this difficult situation.
How could he get your house?
You cannot be sued by him so don't worry about that.
To protect yourself from his taking over if you do become incompetent you should appoint your daughter under a Power of Attorney so she will be in charge if you are not longer competent.
And you can also add her name to the title to the house.
He won't 'be able to sell the house.