405 ILCS 5/5-115
In case any recipient, the estate of any recipient, or the responsible relatives of such recipient are unable to pay the services charges for the recipient provided for by this Act, then the cost of services of such recipient shall be borne by the State, but the cost of clothing, transportation and other incidental expenses not constituting any part of the services shall be defrayed at the expense of the recipient, or the estate of the recipient, or the responsible relatives of the recipient, or of the county of his residence, except that the county is not required to defray expense of clothing. No child is liable under this Act for clothing, transportation, or other incidental expenses of a parent and no spouse is liable under this Act for clothing, transportation or other incidental expenses of a spouse who wilfully failed to contribute to the spouse's support for a period of 5 years immediately preceding the maintenance, such spouse being in need of support or maintenance for hospitalization, however. No parent is liable under this Act for the services charges incurred by a child after such child reaches the age of majority.
405 ILCS 5/5-115