Section 254 - Presentation by corporation counsel, county attorney or district attorney(a) The family court or the appropriate appellate division of the supreme court may request the corporation counsel of the city of New York or the appropriate county attorney to present the case in support of the petition when, in the opinion of the family court or appellate division such presentation will serve the purposes of the act. When so requested, the corporation counsel or county attorney shall present the case in support of the petition and assist in all stages of the proceedings, including appeals in connection therewith. Nothing herein shall be deemed to affect the provisions of section five hundred thirty-five of this chapter.(b) In all cases involving abuse, the corporation counsel of the city of New York and outside the city of New York, the appropriate district attorney shall be a necessary party to the proceeding.N.Y. Family Court Law § 254