N.Y. Est. Powers & Trusts Law § 2-1.15

§ 2-1.15 Consequences of partly ineffective dispositions of trust\nprincipal to two or more beneficiaries\n Whenever the remainder of a lifetime or testamentary trust passes,\nwhether outright or in further trust, to two or more designated\nbeneficiaries, and such remainder is ineffective in part and no\neffective alternative disposition has been made in the governing\ninstrument, such ineffective part shall pass to the other designated\nbeneficiary or, if there are two or more other designated beneficiaries,\nto such beneficiaries in the proportions that their respective interests\nin such principal bear to the aggregate of the interests of such\ndesignated beneficiaries in such principal.\n