25 U.S. Code § 1223 - Distribution of shares
(a) Payments to enrollees, next of kin, or legatees
Except as provided in subsection (b) of this section, the Secretary shall distribute a share payable to a living enrollee directly to such enrollee and the Secretary shall distribute a per capita share of a deceased enrollee directly to his heirs or legatees upon proof of death and inheritance satisfactory to the Secretary, whose findings upon such proof shall be final and conclusive.
(b) Payments to minors or persons under legal disability
A 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, including the establishment of trusts, as the Secretary determines will adequately protect the best interest of such person.