Okla. Stat. tit. 10 § 1416
A resident at an institution named in Section 1406 of this title is liable for his or her care and treatment. This claim of the state for such care and treatment shall constitute a valid indebtedness against the resident and his or her estate and shall not be barred by any statute of limitations. At the death of the resident this claim shall be allowed and paid as other lawful claims against the estate. Persons making application for admission of an individual with intellectual disability to the institution are also liable for the care and treatment of the resident, provided that such persons are legally obligated to support the resident. No person shall be liable for care and treatment solely on the grounds that the person has been appointed guardian of the resident. Provided, further, that no admission or detention of an individual with intellectual disability in the institution shall be limited or conditioned in any manner by the financial status or ability to pay of an individual with intellectual disability, his or her estate, or any relative.
Okla. Stat. tit. 10, § 1416