Upon petition of the guardian, a parent, the minor ward, or, in the case of an Indian child custody proceeding, an Indian custodian or the ward’s tribe, the court may make an order terminating the guardianship if the court determines that it is in the ward’s best interest to terminate the guardianship. Upon petition of a ward who is 18

years of age or older, the court shall make an order terminating the guardianship. Notice of the hearing on the petition shall be given for the period and in the manner provided in Chapter 3 (commencing with Section 1460) of Part 1.