N.Y. Real Property Actions & Proceedings Law § 1513

§ 1513. Guardians ad litem. If it shall appear by the complaint or is\notherwise made to appear to the court at any time before a final\njudgment, that a defendant is or might be an infant, or incompetent to\nmanage himself or his affairs, or that a future interest in the affected\nreal property has been so limited that as yet there are neither certain\nnor presumptive owners thereof in being or ascertained, such court shall\nappoint a guardian ad litem who shall represent and protect such infant\nor incompetent, or the possible interests of the person or persons who\neventually may become entitled to such real property or to an interest\ntherein under such limitation, and in case of the death or failure or\ninability of such guardian to act, a successor, who shall appear for\nsuch infant or incompetent or for such possible interests until the\ntermination of such action.\n