Okla. Stat. tit. 84, § 84-31: Disclaimer of interest in trust - Conditions

An interest in trust may be disclaimed by written instrument

signed by the trustee and income beneficiary of the trust, without

judicial approval and without liability of the trustee to persons

having interest becoming effective after the death of the income

beneficiary, but only if the interest disclaimed passes to the

descendants of grantor. This provision shall not abridge or limit

the right presently existing of a trustee or beneficiary to disclaim

interest in trust.