By accepting a parental or court appointment as guardian, a guardian submits personally to the court's jurisdiction in a proceeding relating to the guardianship that may be instituted by an interested person. The petitioner shall cause notice of a proceeding to be delivered to the guardian or mailed to the guardian by first-class mail at the guardian's address listed in the court records and to the address then known to the petitioner. Letters of guardianship must indicate whether the guardian was appointed by court order or parental nomination.