California Probate Code Sec. § 2805 Any of the following may appear and file written objections to the petition: (a) Any person required to be listed in the petition. (b) Any creditor of the ward or conservatee or of the estate. (c) The spouse of the ward or the spouse or domestic partner of the conservatee or any relative or friend of the ward or conservatee. (d) Any other interested person.