Cal. EDC § 21183

The special proceeding may also be commenced to determine all questions of law and fact affecting the due and voluntary execution and delivery, and the validity and legal effect, of any grant or surrender by any founder, surviving founder, or spouse or surviving spouse of any founder, to, or in favor of, the trustee or trustees, of any rights, powers, privileges, or duties reserved to or vesting in any such person over or concerning any property described in the petition, or over or concerning the institution, which would otherwise vest in or devolve upon the trustee or trustees upon the death of the person granting or surrendering the right, powers, privileges, or duties, and of any relinquishment or release by the founder, surviving founder, or spouse or surviving spouse of any founder, of any other rights, powers, privileges, or duties reserved to or vesting in any such person.