Notwithstanding the provisions of Sections 751 and 1100 of the Family Code, whenever payment or refund is made by this system to a member, former member, beneficiary of a member or estate of a member pursuant to any provision of this part, or to the State Department of Social Services under the provisions of the Welfare and Institutions Code, the payment shall fully discharge this system from all adverse claims thereto unless, before the payment or refund is made, this system has received at its office in Sacramento written notice by or on behalf of some other

person that the person claims to be entitled to the payment or refund.