This discussion explores whether a joint Power of Attorney (GPA) granted to one agent can be revoked by a single principal. It clarifies that while one principal can indeed revoke their portion of the GPA, this must be done through a formal, registered revocation deed, not just an oral statement. A legal notice should be issued to the agent, and if the original GPA was registered, a cancellation deed involving all parties might be necessary to fully nullify the original agreement.