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There were about twelve originally. The clan got bigger and expanded. Which in turn got bigger and expanded...and on and on...for thousands of years. Smaller groups moved out. Hunters were transferred to fill in gaps. Sometimes the job takes them to another village to chase a vamp and they settle there.
After about ten thousand years of this, I'm pretty sure you would have a better chances that I would of finding someone in your close circle less than...a sixteenth cousin. In the beginning, I'm sure there was a lot of relationships between 3rd or 4th cousins but now that's not really the case.