§ 737. Service of summons. (a) Service of a summons and petition shall
be made by delivery of a true copy thereof to the person summoned at
least twenty-four hours before the time stated therein for appearance.
If so requested by one acting on behalf of the respondent or by a parent
or other person legally responsible for his care, the court shall not
proceed with the hearing or proceeding earlier than three days after
such service.

(b) If after reasonable effort, personal service is not made, the
court may at any stage in the proceedings make an order providing for
substituted service in the manner provided for substituted service in
civil process in courts of record.