Guardianship
What is Guardianship?
In New York State, when a person becomes 18 years old they are assumed to be legally competent to make decision for themselves. This means no other person is allowed to make a personal, medical or financial decision for that individual. If a person is "intellectually disabled or developmentally disabled," has difficulty making decisions for themselves and over 18 years old, you can ask the Surrogate's Court to appoint a guardian for him or her.
Source: https://www.nycourts.gov/CourtHelp/Guardianship/17A.shtml
Guardianship Information
Information
http://www.nycourts.gov/courthelp/guardianship/index.shtml
Forms
http://ww2.nycourts.gov/forms/surrogates/guardianship.shtml