Section 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.