Section 4753 Of Chapter 1. General Provisions From California Probate Code >> Division 4.7. >> Part 3. >> Chapter 1.

. (a) Subject to subdivision (b), an advance health care directive may expressly eliminate the authority of a person listed in Section 4765 to petition the court for any one or more of the purposes enumerated in Section 4766, if both of the following requirements are satisfied:
  (1) The advance directive is executed by an individual having the advice of a lawyer authorized to practice law in the state where the advance directive is executed.
  (2) The individual's lawyer signs a certificate stating in substance: