My brother is in a nursing home. I am behind on the monthly bill. The owner will not release him until I pay it. Does he have the right at law ?

My brother is mentally disabled, and I am his power of attorney. I found an affordable place for him to live, but the owner of the current place he lives says that I cannot take him out until I am current with his bills. I do not dispute the amount owed. I dispute the right of the owner to keep him there against my will and continue to charge rates that I cannot afford.