Here. Probably need to do some training down in Texas:

On September 9, 2016, the [Texas] Department’s attorney sent proper notice to the Bureau of Indian Affairs. The [Texas] Department [of Family and Protective Services] also sent a letter dated March 16, 2017, to the Secretary of the Interior, ICWA, and to the Bureau of Indian Affairs, stating that W.C. testified that his Indian tribe was “maybe Lakota Sioux.” According to the Department’s letter, that tribe is not federally recognized as eligible for services or, more particularly, is not an “Indian tribe” pursuant to the ICWA. See 25 U.S.C.A. § 1903(8) (Westlaw through Pub. L. No. 115-22).

Emphasis added.