Question on collapsed pedigrees/

+8 votes
57 views

One of my 3rd great grandmothers was the daughter of double fist cousins.

That is both of her parents were sons and daughters of brothers and sister.

Brother George and William married sisters Mary and Elizabeth, their children John and Karenhappuck married and my 3rd great grandmother was their child.

This is some web to unweave. Only on the frontier and amongst royalty.

Although she had four grandparents, she only had 4 great grandparents and 8 great great grandparents. (my 10th Generation counting me as gen 1)

My quesion is this: How do I unravel this line?

In this line my genealogical 4th great grandparents are my genetic 4th great grandparents, but what is the genetic relationship from me to my genealogical 5th great grandparents, given that I am dealing with not one but two collapsed pedigrees.?

Am I stating the situation correctly?

PS My grandmother, told me back in the 1950's that her great  great grandparents were double first cousins. It took another 40 years of research to prise out and prove that fact.

 

in The Tree House by Anonymous Farrar G2G6 Mach 1 (14.9k points)

3 Answers

0 votes
Hey William. We maybe 18 th cousins. Anyway I have always 2 situations , like yours maybe more.  I have diagrams my relationships like out. The thing that happen s is weird because several things happen twisting relationships back on each other ,for a lack of a better explanation.  I'd like to know what you find out.
by Anonymous Roach G2G6 Pilot (184k points)
0 votes
If your gp's were 7th cousins, or your 6g-gp's were 1st cousins, the effect either way is the same - a pair of your 8g-gp's are in your tree twice and staristically account for twice as much of your DNA.
by Anonymous Horace G2G6 Pilot (568k points)
0 votes
Hi William.  I think I follow all that, and it sounds as if you already have your ancestral lines figured out.  Are you now trying to determine how much of your DNA would have come from each of those ancestors, or perhaps what your relationship would be to other descendants?  I'll have to leave those questions to more knowledgable members, but I'll just comment that I don't think there is anything in the software that would prevent you from constructing your part of the tree exactly as you have described it.  I've had several instances of double cousins and collapsing pedigree, and haven't run into any problem with showing all the relevant relationships, so I don't think documenting this would be a problem.
by Dennis Barton G2G6 Pilot (415k points)

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