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The Texas guardianship is only valid in Texas.
This is not true. Under the Full Faith and Credit Clause of Article IV, Section 1 of the United States Constitution, the Texas order for guardianship is recognized in another other US state. The only thing one has to do is to file to domesticate it in that state as a formal step. But even without that, the order arguably has power in another state. Under that clause, states give authority to each other's "public acts, records, and judicial proceedings of every other state."
Her brother who has a durable POA with no restriction lives in MD.
Arguably, that POA has been voided by the court ordered guardianship. If not, then it may be rescinded formally by the guardian on her behalf, if he wanted to.
The brother with the POA can handles most of her affairs. Can the HB’s family terminate the guardianship in Texas without obtaining a guardianship in NC?
Understand that his POA is presumed valid, but if it was signed after she had the onset, then it may be void. However, it is presumed valid until/unless challenged in Court.
HB's family can indeed terminate the guardianship in NC, but they'd first have to domesticate it (as mentioned before). Or, they can terminate it in Texas (which would involve travel to the court, possibly).
Does Texas have a law (regulation) preventing the termination of the guardianship?
No. However both TX and NC let the Judge make that decision. If the Judge feels that HB still requires guardianship, they may deny it being terminated, or more likely, would simply appoint a court-appointed guardian instead of the family member who wishes to stop down.
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