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In a situation like this, you would have to file for a guardianship, not a POA, as that is a document that is given voluntarily. A judge won't order a forced POA. However, a guardianship can be forced if the petitioner files the guardianship case and then the proposed ward is evaluated by at least two doctors who come to the same conclusion that the ward is unable to manage their own affairs and needs to have a guardian appointed to manage their financial and care decisions.
This is something that you would need an experienced family law or elder law attorney to assist with, especially since I am assuming that father would fight it and object to the guardianship.