I am very sorry to hear this; first adult protective services can be notified whenever there is physical abuse of a senior citizen.
As for the person with a power of attorney; they have a duty to act in the principal's best interest, and this authority can be revoked (by the court) for failure to take action when such action exposes the principal to physical, emotional or financial abuse.
When the principal is no longer able to make binding legal documents - ie to revoke the POA and assign a new one, the court may act on their behalf. So for example, if the agent is removed for breach of the fiduciary duty, and the document names a successor, that person can then act as the principal. If there is no provision for a successor, then the only way to make decisions for a person is either through a guardianship.
That information is here:
Since there are so many prospective individuals that may petition the court for appointment, if the POA does not name a successor, then if possible, the children would agree on which child is best situated to accurately act on behalf of the principal (taking into account time, location, concern). Then that person can petition the court for an emergency guardianship.
If one is concerned that there is imminent harm, then adult protective services may be the quickest way to respond; I would urge you to contact an attorney so they can apply for an emergency application re: either revocation of the power of attorney, or a petition for guardianship.
There are attorneys that specialize in elder care law, which deals with these issues more frequently than a general estate planning attorney, whose focus may be more on estate planning documents.
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Information provided is for educational purposes only. Consultation with a personal attorney is always recommended so your particular facts may be considered. Thank you and take care.