When used in reference to the state supplement program, medical assistance program, temporary family assistance program or supplemental nutrition assistance program, the following terms have the meanings herein assigned: “Commissioner” means the Commissioner of Social Services; “dependent child” means a needy child under the age of eighteen, or under the age of nineteen and in full-time attendance in a secondary school or in the equivalent level of vocational or technical training if, before he attains age nineteen, he may reasonably be expected to complete the program of such secondary school or such training and who is living with his father, mother, grandfather, grandmother, brother, sister, stepfather, stepmother, stepbrother, stepsister, uncle or aunt, or any other relative approved by the commissioner in a place of residence maintained by one or more of such relatives as his or their own home; “beneficiary” means any adult or minor child receiving assistance under the provisions of said programs; “local officer” means the public official charged with administration of public assistance in any town, city or borough.