Re: Estimating grandparents DNA from Grandchildren #dna

Sarah L Meyer

Hi Seth,
That entirely skips a generation. The tier1 utilities at GEDMATCH allow
you to estimate parents DNA >from their children's DNA. The resulting kit is
called a Lazarus kit and can be used to get its own set of GEDMATCH matches.
Whether or not you can piggy back on that (say if you had 3 or 4 Lazarus
kits that all came >from the children of various grandparents I don't know,
because you need kits that are related and those that aren't. And how you
might separate the grandfather >from the grandmother... But maybe just
getting back one generation would help you.
Sarah L M Christiansen
Georgetown TX

From: Seth Bittker <sbittker@...>
Date: Fri, 12 Aug 2016 03:37:15 +0000 (UTC)

For purposes of genetic genealogy it would be wonderful to have DNA >from my
great-grandparents up on FTDNA or Ancestry. As they died a long time ago,
this is seemingly a fantasy. However, it seems to me that technology could
be developed to obtain a good approximation of my great-grandparents'
autosomal DNA based on the autosomal DNA of their surviving grandchildren.
Specifically it seems to me if one were able to get test results >from a
number of their grandchildren, one could then find which sections of DNA are
common between grandchildren >from different siblings. As the different
grandchildren combinations likely would have different areas of overlap, by
combining the areas of overlap across the sets of grandchildren, one could
obtain a large number of sections of overlap for autosomal DNA which would
very likely be >from their grandparents. Admittedly one would not know which
autosomal DNA section came >from which grandparent, but this could even be
refined by looking at DNA results of descendants of each grandparents'
In addition genetic relationships between in-laws and others in the tree
could be an issue, but with additional research this problem could be
minimized as well.

Are there any tools that do something like this yet? If not, is anybody
working on developing technology like this?

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