Cal. Welf. & Inst. Code § 338

In addition to the notice provided in Sections 290.1 and 290.2 the juvenile court may issue its citation directing any parent or guardian of the person concerning whom a petition has been filed to appear at the time and place set for any hearing or financial evaluation under the provisions of this chapter, including a hearing under the provisions of Section 257, and directing any person having custody or control of the minor concerning whom the petition has been filed to bring such minor with him or her. The notice shall in addition state that a parent or guardian may be required to participate in a counseling program with the minor concerning whom the petition has been filed. Personal service of such citation shall be made at least 24 hours before the time stated therein for that appearance.