My sister has POA of my father with dementia, yet I'm the full time live-in guardian. I don't agree with this setup because if something medical came up I have to get her approval before following what I think is best. Dad gave her POA in the event he couldn't care for himself before he was officially diagnosed. I'm totally ok with her running his finances. She has told me that POA cannot be transferred because he has been considered unable to care for himself and has dementia. Is there different rules in different states? Is she right?