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Triangulation Resources In One Place

Roberta Estes

I’ve written a number of articles about autosomal DNA triangulation.

I’ve created this repository to provide gather various resources all in one place to make it easier for you to find what you need.

Triangulation Concepts and Tools

What is triangulation, why it is important for genealogy, and how does one go about triangulating? More importantly, why do genealogists care?

In a nutshell, triangulation allows you to discover or confirm your ancestors or ancestral lines when:

Recently, one of my readers asked why we can’t or shouldn’t use close relatives for triangulation. Another explained that she was just sure she had proof that DNA skipped generations and was appalled that I said it doesn’t. (It doesn’t.) 
Using lots of graphics, I’ve explained why you really can’t use close relatives for reliable triangulation, how you can use their results successfully, and why that reader might have thought DNA skipped a generation. Yes, there is a potential reason why she might think that – and you might find yourself in that same situation too.
 
I compiled everything at the end into a Triangulation Checklist that you can use to make sure you’ve thought of everything, that people are matching in reasonable ways, and to at least consider reasons for anomalies that might drag you down that rabbit hole.
I’ve written two articles that explain chromosome matching, triangulation, and how to use a chromosome browser.

This article explains chromosome matching and triangulation step-by-step to help you sort through your matches.

A chromosome browser is essential to genetic genealogy and specifically, to triangulation, allowing you to visualize your DNA matches on your chromosomes. This article starts at the beginning with what a chromosome browser looks like and explains each step along the way.

It’s important to understand that some people will match you, but won’t match either of your parents, or wouldn’t if your parents were both available to test. The technique of triangulation removes the issue of “false matches” which aren’t identical by descent, because you inherited that DNA segment from an ancestor through one of your parents, but are instead “identical by chance.”

If you’d like to utilize X matching, you’ll want to read this article. The X chromosome has a unique inheritance path, is treated differently by various vendors and you’ll need to evaluate X matches differently.

Genetic Affairs has numerous tools that facilitate and assist with different aspects of triangulation including their AutoClusters, AutoTree, AutoPedigree, AutoSegment and AutoKinship features in addition to their AutoSegment Cluster Tool at GEDmatch.

How to Triangulate?

Each of the major vendors, except Ancestry, provides a chromosome browser along with some type of triangulation tool. Additionally, third parties who do not perform DNA testing offer great supplemental tools. GEDmatch and DNAPainter both provide triangulation tools, allowing you to take advantage of matches from multiple vendors.

I’ve written step-by-step articles detailing how to utilize triangulation at each vendor:

FamilyTreeDNA is the only vendor that provides built-in parental phasing, even if your own parents haven’t tested. You’ll want to either test at or transfer your DNA file (free) to Family Tree DNA, then pay the $19 unlock for advanced tools. As an added benefit, you can also test and obtain matches to your Y DNA (paternal or surname line) if you’re a male and mitochondrial DNA (mother’s matrilineal line) for either sex in order to further your genealogical research.

MyHeritage is the only vendor to incorporate a triangulation tool with shared matches and AutoClusters into their solution. Of course, MyHeritage also provides traditional genealogical research records that they combine with DNA matches and trees in their Theories of Family Relativity feature, showing potential tree connections between you and your matches to common ancestors. You’ll want to either test at or transfer your DNA file to MyHeritage (free), then pay the $29 unlock for advanced tools.

23andMe doesn’t call triangulation by that name, but they provide the functionality, nonetheless. While 23andMe doesn’t support trees in the normal genealogical manner, they are the only vendor who has created a sort of genetic tree, giving you an idea of how your closest matches may fit into a family tree positionally. You can’t transfer files to 23andMe, so if you want to be in their database, you’ll need to test there.

In the late fall or winter of 2020/2021, 23andMe made changes that broke triangulation the way it previously worked.

This article details the problem and provides step-by-step instructions for the workaround

GEDmatch does not provide DNA testing, but they do provide additional tools. You will find a number of people who have tested at Ancestry and other vendors, then transferred to GEDmatch to use their chromosome browser and other tools to obtain additional matches. GEDmatch is the only vendor who triangulates all of your matches at one time – providing a comprehensive report. You’ll want to transfer your DNA kit to GEDmatch (free) and subscribe to their Tier1 Level to utilize their advanced tools.

DNAPainter doesn’t provide DNA testing but does provide a critical service by facilitating the painting of your DNA matches on your chromosomes, identified by ancestor. This allows you to “walk the segment back in time,” meaning to identify the oldest ancestor to whom you can identify a specific segment. I utilize DNAPainter as a central location to house all of my identified segments from all vendors. You can get started by checking out the DNAPainter Instructions and Resources, here.

Testing and Transferring

It’s important to identify as many triangulated segments as possible, which means it‘s crucial to be in all the databases that support triangulation and provide tools.

All major vendors allow you to download your DNA raw data file once you’ve tested, but not all vendors support uploading other vendors’ files instead of purchasing their test.

You can upload (at least) recent versions of other vendors DNA data files to:

The following vendors do NOT support uploads, but you can download your DNA file from these vendors and upload to the vendors above:

I wrote step-by-step instructions about how to download your files from each vendor and uploading them to vendors who accept uploads in the article, DNA File Upload-Download and Transfer Instructions to and from DNA Testing Companies.

Up your genealogy game by transferring and triangulating.

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Disclosure

I receive a small contribution when you click on some of the links to vendors in my articles. This does NOT increase the price you pay but helps me to keep the lights on and this informational blog free for everyone. Please click on the links in the articles or to the vendors below if you are purchasing products or DNA testing.

Thank you so much.

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