They keep lowering blood requirements. Lots of mexicans claiming to be parts of tribes when in reality they genocided he california natives. Federal government wants to dilute the blood line to eventually take the reservation lands.
Source: am member of a federally recognized tribe that only requires one parent be a member for their children to be a member, much like US citizenship, so unless that changes my children for 100 generations will be 100% Native-American just as they will be 100% American