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If I get the question right, the answer is 6.25%, not 25% as the other answer says. Its easy to calculate. Siblings share 50% of DNA on average, it also doesn't deviate much from it as the shared HIR (half identical regions) are very long and can sometimes cover the whole chromosome. There are also the least amount of recombinations within one generation. Half siblings have half of that, as the name says, so 25%.
Sorry, something has gone wrong. Trending Now. Answers. Best Answer: First cousins only share an average of 12.5% of their DNA, so yes, they do share some DNA, and yes, your child would also have some of the same DNA, but not enough to make it a problem. The way it works is your child is 50% you and 50% his other parent. Your 50% is half each from your parents, so your child is 25% of each grandparent. First cousins have a grandparent in common, but the other DNA is not shared.