43 C.F.R. § 30.401

An eligible purchaser at probate is any of the following:

(a) Any devisee or eligible heir who is receiving an interest in the same parcel of land by devise or descent in the probate proceeding;

(b) Any co-owner;

(c) The Indian Tribe with jurisdiction over the parcel containing the interest; or

(d) The Secretary on behalf of the Tribe.