Your DNA represents only half of the DNA of the person 'providing' it anyway - so it is a sort of lottery - I remember a set of fraternal twins where one was fair and the other was dark - all over, that is, and it was thought improbably, impossible, the result of infidelity (so they had different fathers) but it was just a result of the selection of chromosomes from the parents being different, and in their cases resulting in them being different colours - identical grins though. They thought it was hilarious. In my family my Brother got the contracture of the ligaments in his hands from our Viking forebears and I got the temper. DNA is interesting - but it is not even half the story of ancestry.
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