From a genetic point of view, siblings share 50% of their DNA. Both receive information from the father and the mother, but the reception of this information is random. Just as there are siblings where one of them physically resembles the paternal side more and another more the maternal side, the same can happen in the ancestry results. In this way, the father's ancestry may be more represented in one of the siblings and the mother's in the other, leading to differences between the results of both.
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tellmeGen