Synopsis As Introduced Amends the Juvenile Court Act of 1987. Relocates a provision regarding special immigrant minors from the Abused, Neglected, or Dependent Minors Article to the General Provisions Article. Amends the Probate Act of 1975. Provides that a petition for guardianship of the person of a minor who is 18 years of age or older, but who has not yet attained 21 years of age, may be filed by a parent, relative, or nonrelative person over the age of 21. Provides that a court making determinations concerning such a petition shall consider the best interest of the minor. Provides that an appointed guardian shall have responsibility for the custody, nurture, and tuition of the minor, and shall have the right to determine the minor's residence based on the minor's best interest. Provides that a minor who is the subject of a petition for guardianship or for extension of guardianship may be referred for psychological, educational, medical, or social services under certain circumstances. Makes other changes. Effective immediately.