Actually, the genealogical DNA tests Colonel McNeal is talking about don't show specific relationships to individuals in the past, unless you have their DNA (hair, blood, bones, etc.).
It still wouldn't show the specific 'family tree', just whether you're related.
For example, the Y-chromosome DNA test looks at the paternal (father's) bloodline. It can show whether the two tested males are related or not. Since only men carry the Y-chromosome, women who want to investigate their father's bloodline must get a male relative (father, brother, uncle - blood-related, not by marriage) to be tested.
The mitochondrial DNA test looks at the maternal (mother's) bloodline. Both men and women may be tested with this one.
Both of these tests will show how closely the two people being tested are related, within a couple of generations (anywhere from 3 to 10, from what I've read). Exactly how close depends on how expensive you want to get.
You can look up 'genealogical DNA testing' to find out more.
Originally Posted by EagleJCS
Actually, the genealogical DNA tests Colonel McNeal is talking about don't show specific relationships to individuals in the past, unless you have their DNA (hair, blood, bones, etc.).) he wanted to know if it descended from the Normandy Duke, for that reason asked if those types of registries like seeing the relation existed.
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