Here is the opinion from the California Court of Appeals (3rd District) in In re K.P.
An excerpt:
We decline to extend the ICWA to cover an allegation of membership in a tribe not recognized by the federal government. Neither HHS nor the juvenile court was under a duty to comply with the notice provisions of the ICWA.
American Indian Tribal Law
Facing the Future: The Indian Child Welfare Act at 30
The Eagle Returns: The Legal History of the Grand Traverse Band of Ottawa and Chippewa Indians
The Indian Civil Rights Act at Forty