How is an Indian child's tribe primarily defined?

An Indian child's tribe is primarily defined by the tribe with which the child has significant contacts. This definition recognizes the importance of the child's connection to a specific community and its culture, which goes beyond mere biological ties or geographical proximity. It encompasses the social, cultural, and familial relationships that focus on the child's upbringing and identity within that tribe.

This approach emphasizes the child's life experiences and the role of the tribe in providing cultural identity, social support, and community belonging. It aligns with the broader principles of tribal sovereignty and self-determination, ensuring that each tribe has the authority to define its membership based on meaningful connections rather than simply biological factors or geographic considerations.