(a) Unless excused by the court for good cause shown, it is the duty of the petitioner to give notice of the time and place of the hearing on the petition, in person or by mail, to the minor, if the minor is 14 years, or older, and to the relatives and the short-term guardian of the minor whose names and addresses are stated in the petition, not less than 7 days before the hearing, but failure to give notice to any relative is not jurisdictional.
     (b) In any proceeding for the appointment of a standby guardian or a guardian the court may appoint a guardian ad litem to represent the minor in the proceeding.