For the guardianship letter to be considered legally enforceable, it must be notarized or approved by a court-authorized representative.
In such situations, a court decides whether or not to appoint a legal guardian to the person concerned. Note that an adult has the right and may refuse to sign a guardianship form.
Legal guardianship documents and laws vary from state to state. A legal guardian is a person responsible for the ongoing care, protection and administration of an estate, adult or child.
