Okla. Stat. tit. 18, § 18-381.43: Deposit accounts of administrators, executors,

conservators, guardians, trustees or other fiduciaries.

Any association or federal association may accept deposit

accounts in the name of any administrator, executor, conservator,

guardian, trustee, or other fiduciary for a named beneficiary or

beneficiaries. Any such fiduciary shall have power to vote as a

member of a mutual association as if the membership were held

absolutely, to open and to make additions to, and to withdraw such

deposit account in whole or in part. The withdrawal value of any

such deposit account, and earnings thereon, or other rights relating

thereto may be paid or delivered, in whole or in part, to such

fiduciary without regard to any notice to the contrary as long as

such fiduciary is living. The payment or delivery to any such

fiduciary or a receipt or acquittance signed by any such fiduciary

to whom any such payment or any such delivery of rights is made

shall be a valid and sufficient release and discharge of an

association for the payment or delivery so made. Whenever a deposit

account shall be opened by any person who designates himself or

herself or another as trustee by written declaration of trust, which

provides that the trust shall terminate upon the death of such

person, then, in the event of the death of the person so described

as trustee, the withdrawal value of such deposit account or any part

thereof, together with the earnings thereon, may be paid to the

person for whom the deposit account was thus described to have been

opened. The payment or delivery to any such beneficiary,

beneficiaries or designated person for any such payment or delivery

shall be a valid and sufficient release and discharge of an

association for the payment or delivery so made.