How do you identify people who have married relatives either accidental or otherwise

+2 votes
If two children's descendants marry several generations later it condenses the ancestor list. I cant find the technical term for it, but is there a way to identify them.
in Genealogy Help by Robert France G2G3 (3.5k points)
retagged by Ellen Smith

1 Answer

+5 votes
Best answer
It is called pedigree collapse when you reach the stage where your ancestors are no longer unique.

Just treat them the same way as you would anyone else. Connect each child to the relevant parents and if you then end up with a set of ancestors showing twice they will show correctly in your pedigree view.
by Lynda Crackett G2G6 Pilot (685k points)
selected by Robert France
in the Ahentafel it displays as "same as person no: nnnnn, would that be the correct interpretation?

When I look at the Ahentafel numbers (which directly reflect generations) i can sometimes see 3 generations difference between person A in one line and their secondary instance in the other line.

the quandary is that this person could (and this may be a stretch) thier own father in law?

Yes it did keep me awake last night!

Back to the question, from a DNA perspective, pedigree collapse clearly suggests that traditional methods get a bit screwed up?
Robert, Thanks for the best answer star.

I have never tried to address this in the Ahnentafel system, but it seems logical to use «same as». From a DNA perspective it just means that you need to think more when analysing the number of cMs. A match might look closer than it actually is since you may have received differing segments of DNA through the two lines of descent and have more that correspond with the match.
Thanks Linda. That's certainly something that crossed my mind but does explain "better" dna matches in earlier generations.

Good thinking!

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