Judgment unanimously affirmed without costs. Memorandum: Supreme Court properly dismissed petitioner's application seeking a writ of prohibition. In our view, respondent was acting within his lawful authority in ordering disclosure of the jointly filed tax returns of petitioner and her husband, who is a party to the Family Court support proceeding (see, Family Ct Act § 439 [c]; Benson v. Benson, 108 Misc.2d 892, 894).