If my great uncle married my great aunt, (no relation to each other)

[Mr. McD]

What degree of cousin would I be to their g granddaughter? Double third cousin?:shrug:

[Bitwit1234]

1. My father's brother married my mother's sister and they were

neither related. But -- you always say the person is your first cousin. once or twice or third times removed however the cousinship is. That is the correct way genealogist delineate it.

Did you happen to see the PBS special last night about African American genealogy research? Most most fascinating....they took - black celebs such as Don Cheatle, Maya Angelou (sp) and Chris Rock and traced them all the way back to Africa to the direct tribe they descended from. They even told one prof - who does research - that his ancestor came to America on one of seven ships to the Cheseapeake Bay area...hows that for a trace. They also traced the same guy's ancestors in another line to Ireland. To Naill of the nine hostages. Of course if you come from Ireland you have to remember that 80% of the people that live there are descended from Naill. But it was interesting. That's one of the advantages of mt-DNA.

[Spider Jerusalem]

2. Double second cousin once removed

The common ancestors are your great-grandparents (her great-great grandparents).

[Mr. McD]

3. Her g grandmother and my g grandfather were brother and sister

Another g grandfather's brother is her g grandfather, my gg grandparents are also her gg grandparents.
That would be third cousin's. I just don't know about the double dose relationship.

[Spider Jerusalem]

4. So that makes you double third cousins

the double part comes in because you share two sets common ancestors at the same generation. If you only have one set of common ancestors at that generation, the relationship is just third cousin.

[Mr. McD]

5. I should have Goggled first.

Double cousins

Generally, one's cousinship to another is determined by a connection through only one parent's biological family. But an individual's cousinship to another individual may be determined by a connection through both of one's parents. These cousins are biologically connected to both the maternal and paternal family trees and that cousinship is termed a double cousin. Another term used to describe this is cousins on both sides.

If a pair of siblings from one family each form a couple with a pair of siblings from another family, then the children of these two couples will be double first cousins to one another. The children of the couples would already automatically be first cousins due to the fact that they are children of one of their parent's siblings, but in this case the children of their mother's sibling, are also the children of their father's sibling, and thus they are double first cousins. Such cousins have double the consanguinity of ordinary cousins and are as related as half-siblings. Instead of the 12.5% consanguinity that simple first cousins share with each other, double first cousins share a 25% consanguinity with each other. Further, if identical twins form a coupling with a corresponding set of identical twins, the children of these two couples, though legally (double) first cousins to one another, would genetically be as closely related to each other as ordinary full siblings.

Sometimes the children of these unions are called cousin-siblings, cousin-brothers, or cousin-sisters. Note that no inbreeding has to occurred to create these close kinships.


http://en.wikipedia.org/wiki/Cousin#Double_cousins

[Quakerfriend]

6. I think you would be a third cousin, once removed. No?