By accepting a parental or court appointment as guardian, a guardian submits personally to the jurisdiction of the court in any proceeding relating to the guardianship that may be instituted by any interested person. Notice of a proceeding shall be delivered to the guardian or mailed to the guardian at the address listed in the court records and to the address then known to the petitioner. Letters of guardianship shall indicate whether the guardian was appointed by parental appointment or by court order.