25 C.F.R. § 16.2
The regulations in this part set forth procedures for discharging the responsibilities of the Secretary in connection with the performance by State courts, as authorized by Federal statutes, of certain functions which affect properties in which a restricted interest is owned by an Indian of the Five Civilized Tribes. These State court functions pertain to such proceedings as guardianship, heirship determination, will probate, estate administration, conveyance approval, partition of real property, confirmation of title to real property, and appeal from action removing or failing to remove restrictions against alienation. In addition, the regulations in this part set forth procedures for discharging certain other responsibilities of the Secretary not necessarily involving State court functions, such as escheat of estates of deceased Indians of the Five Civilized Tribes.
25 C.F.R. § 16.2