(a) General rule.--The county Title IV-D attorney shall at all times aid in the enforcement of the duty of child support and child and spousal support and shall cooperate with the domestic relations section in the presentation of complaints or in any proceeding designed to obtain compliance with any order of the court.

(b) Representation of complainant.--The district attorney, upon the request of the court or a Commonwealth or local public welfare official, shall represent any complainant in any proceeding under this subchapter.

(b.1) Representation of Commonwealth.--In matters relating to the establishment and enforcement of child support and child and spousal support, the Title IV-D interests of the Commonwealth shall be represented, where appropriate, by the county Title IV-D attorney in a proceeding for child support and child and spousal support.

(c) Joinder of Department of Public Welfare.--Whenever the record in any support action or proceeding indicates that the persons for whom support is sought have received public assistance from the Department of Public Welfare¹ at any time since the initiation of the matter, the department may become a party to the action or proceeding by filing an entry of appearance. This entry of appearance may be entered without leave of court at any time and at any stage of the action or proceeding.