In all cases where a person under the age of 18 years engages in conduct which is prohibited by the ordinances of the city or the statutes of the state of Washington, the parent or parents, legal guardians, or persons, who, by any act or omission, encourages, causes or contributes to the commission of such violations of ordinance or statute by such person under the age of 18 shall be guilty of a misdemeanor. (Ord. 5682 § 1, 2002.)