It shall be unlawful for any person to loiter or trespass upon lots and graves of the Village Cemetery or for the parent or guardian of any child under the age of sixteen (16) to permit such child to be within the cemetery grounds unless accompanied by an adult person; provided nothing herein shall be construed to prohibit any person having lawful business in the cemetery in connection with the improvement thereof or persons visiting the graves of relatives or friends from being in the cemetery in accordance with the rules.