Max If you want to pick nits. I might add that the mDNA is passed from Mother to child (of both sexes) not to just daughters. But it makes little sense to test males for mDNA as it would only go back 1 generation. So you are saying an exact match its is as likely that the common ancester was more than 7 generations as less. The best use of DNA I have seen has been to disprove a close relationship, like the Conklin Family Study which proved that John of Flushing and Rye was unrelated to the Conklins of Long Island. Or to prove a close relationship can't remember the surname here but that a family in Ohio was descended from the same common ancestor as the family in Connecticut even though no one had been able to find records linking the two families. Julia Coldren-Walker FamRSearch@aol.com