Texas law authorizes you to designate a guardian of your person and/or estate in case you later become incapacitated to the extent that a court supervised guardianship is required. A Declaration of Guardianship if Need Arises may not be necessary if you have a statutory durable power of attorney or revocable trust and a medical power of attorney. However, you may need a declaration of guardian, so that a person other than the agents designated by you cannot preempt your power of attorney by being appointed as your guardian. You may also declare whom you do not want the court to appoint as either guardian of your person or guardian of your estate.