Although he may be a part time employer, he is still covered by the First Schedule of the Employment Act. As such he is entitled to the benefits under the Act. See definition below:
"part-time employee" means a person included in the First Schedule whose average hours of work as agreed between him and his employer do not exceed seventy per centum of the normal hours of work of a full-time employee employed in a similar capacity in the same enterprise whether the normal hours of work are calculated with reference to a day, a week, or any other period as may be specified by regulations;
If you are still in doubt, you may consult the local Labour Department..