Anonymous wrote:I’m not sure what type of document you have or what state you are in, but many health care proxy/advanced directive forms are not effective unless the signer is not capable of making their own decisions so you have no authority currently.
I agree you should reach out to an elder law/family law attorney for advice on what documentation you need in this situation.
Sounds like the sibling is the health care proxy. And if the parent was brought into the ER, there very likely could be a chance they were confused or otherwise altered and it got out into play. At this point, OP needs to consult with an an attorney who deals with elder law. This is a tough situation to prove and get control of.