If the person so summoned under section 43-263 is other than a parent or guardian of the juvenile, then the parent or guardian or both, if their residence is known, shall also be notified of the pendency of the case and of the time and place appointed; if there is neither a parent nor guardian, or if his or her residence is not known, then some relative, if there be one and his or her residence is known, shall be notified, except that in any case the court may appoint a guardian ad litem to act in behalf of the juvenile.
Neb. Rev. Stat. §§ 43-265