What is needed for my brother to show he is Power of Attorney over my ill father?
Typically, the power of attorney document must be produced when requested. Mention of the document in another document may be used as evidence of its existence, but it will be an evidentiary matter for the court to determine its existence. If the father has the mental capacity
to understand his actions, he may create a new power of attorney. Otherwise, you may check at the county recorder's office to see if the document may have been filed there. Please see the lost will link below for suggestions related to locating a lost document.