Can a husband legally divorce his wife if she suffers from dementia?

Question Details: They have bee married or 25 years. The wife is in a full-time care facility and not of sound mind. Her husband wants to sell the house and split it 50/50 but discontinue paying for her care. He has told her children that their divorce will go through in less than 30 days and he is her POA. She has never been declared legally incompetent in court so there is nothing that they can do. They are not sure of the other assets/accounts they have and he will be taking those. The couple is 70/80's years old.

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