It shall be unlawful for any person, being the parent, guardian or having the custody and control of any child under the age of eighteen (18) years, to willfully encourage, cause or permit said child to violate the provision of this chapter, and upon conviction thereof, said parent, guardian or custodian shall be subject to a fine for the first offense in the sum of not more than $25, and for subsequent offenses in the sum of not more than $50.