<p>^^Look here for Federal guidelines on being officially recognized as a member of a tribe:</p>
<p>[U.S</a>. Department of the Interior - Indian Ancestry - Enrollment in a Federally Recognized Tribe](<a href=“http://www.doi.gov/enrollment.html#Requirements]U.S”>http://www.doi.gov/enrollment.html#Requirements)</p>
<p>For many years the blood quantum requirement for most tribes was 1/4. But in recent years some have lowered it to 1/8, since due to intermarriage they were running out of people who qualified. People who have only a vague or remote ancestor and/or who have long since lost contact with the tribe almost never qualify for federally-recognized tribal membership.</p>