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Full siblings (full brothers or full sisters; or brother and sister) have the same biological parents and are 50% related (full siblings share 50% of their genes out of those that vary among humans). Identical twins by definition are 100% related.
Even though siblings share half their DNA, they can share any number of markers in a DNA test. They might match up at all of them or none of them. Or more likely, they will match up at some number in between.This might seem weird at first.ith simple DNA tests, siblings can match at any number of markers. They can match at all, none, or somewhere in between. This has nothing to do with how related they actually are at the DNA level. Siblings are about 50% related.