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Simple math shows that if we have 2 parents, 4 grand parents, 8 great grand parent and so on, if we go 60 generations back we would have 1,152,921,504,606,846,976 ancestors. Obviously, this is mathematically impossible, so many of those ancestors would be doubles and relatives of one another (for example, two of your great grandparents who married different people can have the same parents). As you go down the line, this happens more and more.
The point is that it becomes mathematically impossible that, at some point, everyone isn't related to everyone else. Modern DNA testing has confirmed this.
How would Nazism, with its extremely unscientific view of race, reconcile modern genetics with their insane traditions?