N.Y. Comp. Codes R. & Regs. tit. 18, § 436.6
(a) The social services official, on an annual basis, must remind the relative guardian or the successor guardian of the relative guardian's or successor guardian’s obligation to support the child and to notify the social services official if the relative guardian or the successor guardian is no longer providing any support or is no longer legally responsible for the support of the child. Where the child is school age under the laws of the state in which the child resides, such notification must include a requirement that the relative guardian or the successor guardian must certify and provide satisfactory documentation to the district that the child is a full-time elementary or secondary student or has completed secondary education. For the purposes of this section, an elementary or secondary school student means a child who is:
(b) Where the child has attained the age of 18 but is under 21 years of age, the relative guardian or the successor guardian must certify and provide satisfactory documentation to the district that the child is:
(5) incapable of any of such activities due to a medical condition, which incapacity is supported by regularly updated information in the child's case record.
(c)
(2) For the purpose of subdivision (b) of this section: