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Any POA signed by your husband after diagnosis of dementia will be of no enforceability if he has been declared incompetent.
If a court has not declared him legally incompetent, though, it is possible, if he has periods of lucidity, for him to give a valid POA. The son would want witnesses when it is signed who can testify that he was lucid and fully aware of the purpose and consequences of the document he was signing.
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