What is it?

 The determination of who has the legal duty and power to manage and protect the estate of a person under age 18, or the estate of a person 18 years or older, who, because of some legal disability such as incompetence, is unable to manage the estate themselves.

Where do I go?

 The Probate Court where the person resides, or, if the person is a nonresident where the property is located. However, if the person is under age 18, and the matter arises out of a protective proceeding, a delinquency proceeding or a domestic relations custody case, then the Family Court.