My dad is in the ICU at the cancer center on a ventilator and cannot speak for himself. He is legally married to my mom and we just found out he has a girlfriend. She claims she has POA over my father. This girlfriend has POA at the hospital on paper, but my dad requested verbally that my sister to be POA but was not able to sign the paperwork. Who has more power my legal mom or the girlfriend that claims POA. What to do.