Any balance shall be paid to the Commonwealth agency responsible for supervising the placement of the child for use by such agency in accordance with paragraph (2).
"Assistance group." The term shall have the meaning given in section 402 of the act of June 13, 1967 (P.L. 31, No. 21), known as the Public Welfare Code.
"Family." The term shall include the child for whom support is received, the custodial parent living with the child and any other person in the same assistance group as the child.
23 Pa.C.S. § 4374