Let's say both cousins are related through their grandmother on their fathers' side, but neither have parents or grandparents still alive... so that rules out the possibility of getting a dna sample from them. But if 2 cousins were to take a dna test themselves, is it possible that they could determine whether or not they had the same grandfather on their fathers' side?
ok, I realize that, but if they had the same grandparents, wouldn't 50% of the cousin's blood be similar enough to warrant an answer?

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