father is incpacitated, mother is not on any of his accounts Father is…

father is incpacitated, mother is not on any of his accounts
Father is incapacitated due to a motorcycle accident he has a closed head injury. My mother is not listed on his bank account whatsoever, no one is on the account with him, can she take her marriage certificate to the bank or will guardianship papers need to be filed, he has no durable power of attorney to our knowledge. He totally supports her financially and pays bills that are in her name. My father’s bank account was frozen by the bank due to a family member’s well intentioned attempt to go to the bank and try to get his PIN number. My father is not currently able to make decisions for himself. Right now, my sister is trying to handle his affairs, I am trying to get information that could help, thank you. We have no real idea how long my father will be incpacitated.

durable power of attorney My mother’s durable power of attorney was signed 15…

durable power of attorney
My mother’s durable power of attorney was signed 15 years ago while my father, listed as her agent, was still alive. My brother and I were named as first and secon agents. My father has since died and my mother has remarried. IS this document still valid or does her current husband now serve as her agent?