25 USC 992 - Payments to adults, heirs or legatees; shares under certain amounts to revert to tribe; protection of minors and persons under legal disability

(a) Except as provided in subsections (b) and (c) of this section, a share or proportional share payable to a living adult shall be paid directly to such adult;
(b)  a share payable to a deceased enrollee shall be distributed to his heirs or legatees upon the filing of proof of death and inheritance satisfactory to the Secretary of the Interior, or his authorized representative, whose findings and determinations upon such proof shall be final and conclusive: Provided, That proportional shares of deceased heirs amounting to $10 or less shall not be distributed, and no inherited share amounting to $5 or less shall be paid, and the money shall revert to the tribe;
(c)  a share or proportional share payable to a person under twenty-one years of age or to a person under legal disability shall be paid in accordance with such procedures as the Secretary determines will adequately protect the best interests of such persons.