an arbitrary line, perhaps?
or perhaps you are changing the rules on the fly. you were the one who originally traced the bloodlines back to ancient egypt and babylon.
"The Bloodlines that rule over this planet today
are the same bloodlines that ruled this planet
through Rome,Babylon,Egypt,Sumeria and beyond....."
it's just a rotten theory that fails the maths test. sorry. you can cousin your way to a relationship between almost anyone.
i haven't even got into the history.