California Code, Welfare and Institutions Code - WIC § 792

The judge shall issue a citation directing any custodial parent, guardian, or foster parent of the minor to appear at the time and place set for the hearing, and directing any person having custody or control of the minor concerning whom the petition has been filed to bring the minor with him or her. The notice shall in addition state that a parent, guardian, or foster parent may be required to participate in a counseling or education program with the minor concerning whom the petition has been filed. The notice shall explain the provisions of Section 170.6 of the Code of Civil Procedure. Personal service shall be made at least 24 hours before the time stated for the appearance.