Cousins whose parents are identical twins share 25 percent of their DNA, instead of the usual 12.5 percent. While full-siblings share 50 percent of their DNA, half-siblings share 25 percent. That's why, though children of identical twins are legally cousins, they are genetically the equivalent of half-siblings.
MY DAD AND HIS COUSINS ARE NOW OFFICIALLY HALF SIBLINGS, THEREFORE GIVING ME TWO MORE UNCLES AND AN AUNT.
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THE FACTS
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