A brother granted a notary GPA to his sister, who then sold a property to a third party without his knowledge. The validity of this sale is questioned due to the GPA not being registered or specific. Later, the brother gifted the same property to the sister, but this gift deed is likely invalid as the property was already sold. The third party, not in possession and without proper documentation, may face challenges in claiming the title. Expert advice suggests the unregistered GPA sale is invalid, and the brother might be liable to the third party.