how do dna tests work? such as 123 and me, ancestry dna, etc. they probably don’t have the dna of random people from 100s of years ago right? and if it goes off of last names, how is it reliable?
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It requires both peoples DNA, they wouldn’t be able to tell you if your related to Elvis, unless some of Elvis’ kin has taken the test. Or lets say they would have no clue if your related to King George III as he is far back enough he never took the test, and his kin prolly hasn’t so it would be far down the line, at which point you’d have to ask the person your related to if they have relation to KGIII or hope their family tree is accurate.
Last names obviously don’t work as I’m not related to a president, but, have the same last name as a prior one. If you ask my family the best they say is, if you go up the tree really high, and then back down the tree, than maybe. Chances are My and the presidents wouldn’t match enough to give a good statistic.
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