Tuesday, May 12, 2020

Update To MyHeritage Theory of Family Relativity™ Estimates

MyHeritage updated their Theory of Family Relativity DNA matches last week - see Update to Theory of Family Relativity™ on the MyHeritage Blog.  The MyHeritage blog post indicates that there are over 42% more Theories now for all DNA customers.

I am really happy that they did this because, just before the last update, I changed my MyHeritage Tree linked to my DNA test, and my tree showed as Private in the July 2019 Theory charts.  That was frustrating for 10 months.

In the July 2019 update, I had 12 Theories, of which two were obviously wrong (to me!).  

With this current update, I have 9 Theories.  The two wrong ones are gone, and one of my correct Theories is gone for some reason.  The DNA matches are still there, but the Theories are gone.

Here is the opening screen for my DNA Results:

The pink box is for the Theory of Family Relativity, and I can see my Theories by clicking the "View Theories" button:

When I do that, it says that I have 9 Theories, although I have 8,386 DNA matches in total.  That's 9 out of 8,386, or 0.11% - 1 out of 900 of my matches.

I clicked on the first ToFR match (I've tried to anonymize these charts) and I can see the Theories (I have 5 different ones for this match):

I can see that MyHeritage has used my MyHeritage tree on the left, and my matches MyHeritage tree on the right.  We both have the same person - Roy Herbert Dyar (1888-1974) - and that is the "transfer point" from my tree to their tree.

There are several screens on each DNA match page, and one of them is the chromosome browser.  I can see that I share 3 segments on 3 different chromosomes:

The image above is truncated and shows only the first 13 chromosomes.  I ran my mouse over the purple portion of Chromosome 6 and the popup box told me the segment size, the start and end points of the segment, and the number of SNPs.  Not shown are segments on Chromosomes 21 and 22.

I wrote down the chromosome number, the cM value, and the genomic position (start and end points) of the segment for each of the three segments. 

What do I do with that information?  First, I add it to my Note for the DNA match - here is the Note for this DNA match:

The Note says:

[name redacted] is a MyHeritageDNA DNA match with Randall Seaver,
Sharing 40 cM in 3 segments.  They are 4th cousins, with common 
ancestors of 3rd great-grandparents Samuel Vaux and Mary Ann 
Underhill.  Line in RM tree  Shared segments
C06 - 26.0 cm - 970404-13017916
C21 - 7.2 cM - 17005987-19536638
C22 - 6.9 cM - 17661372-19677254

The second thing I have done is added this particular cousin relationship to my RootsMagic family tree, with a similar Note on a "DNA Match" Fact.  

The third thing I can do is take this information, and information for as many of my MyHeritage DNA matches as possible, and add the chromosome segment position data to DNA Painter so I can identify which segments on each chromosome are from which known ancestor.  I am in the process of collecting this data from MyHeritage, 23andMe and FamilyTreeDNA for DNA matches with identified common ancestors.  Of course, Ancestry.com does not provide that information for AncestryDNA matches.

All of the MyHeritage DNA Matches provide the chromosome browser information, and also the Shared Matches of those DNA Matches.  But I need to find a common ancestor for DNA Painter to use for each of them.  The nine MyHeritage DNA Matches with a Theory of Family Relativity provide this information, as do the DNA Matches that have a large enough tree, or that I "know" from other family records.  So I have 14 sets of the chromosome browser data.

I hoped that I would have many more Theories of Family Relativity with each update.  That didn't happen this time.  Maybe next time?  The problem, of course, is that not enough people have a big enough MyHeritage tree, or have not added their tree profiles to the FamilySearch Family Tree, the Geni tree or the WikiTree.  I find it amazing that so few MyHeritage DNA matches have a tree of 10 profiles or more.


Disclosure:  I receive a complimentary subscription to MyHeritage, and gave received other material consideration in past years.  I uploaded my autosomal DNA raw data to their DNA product.  This does not affect my objective analysis of MyHeritage products.

The URL for this post is: https://www.geneamusings.com/2020/05/update-to-myheritage-theory-of-family.html

Copyright (c) 2020, Randall J. Seaver

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