“Responsible relative” means the spouse or, if the recipient is under 18 years of age, parent of a recipient or client receiving services in facilities or programs of the Department. However, if the definition of “responsible relative” in this Act is in conflict with the definition of “responsible relative” in any Federal statute and rules or regulations thereunder, under which the recipient or client is otherwise eligible to receive benefits, the definition of the Federal Act, rules, or regulations shall prevail.