The relative of a patient in your medical wards asks you if you would witness a power of attorney so that the relative can manage the patient’s affairs on his behalf. You know that the patient is...

The relative of a patient in your medical wards asks you if you would witness a power of attorney so that the relative can manage the patient’s affairs on his behalf. You know that the patient is mentally disordered but is reputed to be quite wealthy. What advice would you give to the relative?