N.Y. Surr. Ct. Proc. Act § 1755
Any person who is intellectually disabled or person who is developmentally disabled eighteen years of age or older, or any person on behalf of any person who is intellectually disabled or person who is developmental disabled for whom a guardian has been appointed, may apply to the court having jurisdiction over the guardianship order requesting modification of such order in order to protect the person who is intellectually disabled's, or person who is developmentally disabled's financial situation and/or his or her personal interests. The court may, upon receipt of any such request to modify the guardianship order, appoint a guardian ad litem. The court shall so modify the guardianship order if in its judgment the interests of the guardian are adverse to those of the person who is intellectually disabled or person who is developmentally disabled or if the interests of justice will be best served including, but not limited to, facts showing the necessity for protecting the personal and/or financial interests of the person who is intellectually disabled or person who is developmentally disabled.
N.Y. Surr. Ct. Proc. Act Law § 1755