DNA Matches: What You Can Do with All Your Genetic 4th Cousins

(Update 2020) When genealogists take an ancestry DNA test, they are looking for more than just their ethnicity results. They are also very interested in receiving information on other people who have tested who closely genetically match them. They want to know who the closest matches are, and if those matches have family tree information that they can share. 

However, with all the people testing these days, (some being genealogists and some not) the volume of matches can become overwhelming very quickly. 

Are you one of those people who have way too many genetic “4th cousins or closer” among your DNA matches? Have you ever wondered “What do I do with all these matches?!” If so, keep reading. We’re going to explore some of your options, and most importantly, how to determine how genetically close your cousins really are. 

what to do with your 4th cousins DNA genetic genealogy

Doing the DNA Math on Your Cousins

Math can provide us with a degree of certainty in genetic genealogy. Each of us has two biological parents. We have four biological grandparents, and eight great-grandparents.
too many 4th cousins DNA matches

However, the farther back we go the less we can rely on math.

For example, on paper you should have sixty-four 3rd great grandparents. However, many of us find that the same person occupies more than one slot on our pedigree chart. While this significantly decreases the workload for traditional genealogy, it adversely impacts your genetic genealogy. Especially when it comes to that long long list of 4th cousins you have in your match list at any of the three major DNA testing companies.

Depending on how intermarried your lines are, you may be seeing individuals on your match list that genetically look like your fourth cousins, but they are genealogically your sixth cousins – EIGHT TIMES!  So how can you tell the difference?

There are two parts to that answer: one you can control, and the other you can’t.

Distinguishing DNA Matches with Genetic Tools

While your fourth cousins and your eight-time-sixth cousins may look similar genetically, there are often small clues in the genetics that can help you tell the difference. This distinction can sometimes be detected by a testing company who, through research and validation, has been able to fine-tune their algorithms to detect these subtle differences.

DNA cousins

Your Genetic 4th Cousins

You can participate in this double checking process by using some of the genetic tools that are available to you at Family Tree DNA, or at Gedmatch.com. But since you may not be an aspiring geneticist, let’s focus on the genealogical work you can do to determine if a match is truly a fourth cousin.

Use Google Earth to Plot Your DNA Matches

A fourth cousin designation just means that you and your match are separated by between six and twelve degrees (people). So that might be five back on your chart to your common ancestor, and five down to your match, which would make you true fourth cousins. It could also be some other permutation of that.

For our example, let’s assume true fourth cousins. That means that the two of you share one of thirty-two 3rd great grandparents (16 couples). In order to find out which set, you have two genealogical identifiers: surname and location.

Therefore, the first thing you should do is make a list of the surnames and locations of those thirty-two 3X great grandparents.

Now, most of us do not know all 16 of those couples, so you are going to have some holes. Feel free to fill in those holes with surnames on subsequent generations that will carry through to this fifth generation.

A great tool to plot your own list of ancestors geographically is the free downloadable Google Earth software

Check to see if you have the latest version of Google Earth downloaded to your desktop or laptop computer. On your desktop, look for a grey and white globe. If you see a blue and white globe, you have the older original free version of Google Earth. However, a few years ago, Google made their Google Earth Pro version free to everyone, and it is now the standard. 

If you do have Google Earth Pro (the grey globe software) then you’re ready to go.

Google Earth on your computer desktop


The grey Google Earth globe on the desktop.

If you don’t have it, then you will need to download it. 

How to Download the Free Google Earth Software:

  1. Go to http://www.google.com/earth/download/gep/agree.html
  2. Click the blue download button
  3. Read the Terms and Conditions
  4. If you agree to them, click the Agree and Download button
  5. Follow the installation guide
  6. When complete click Run Google Earth

Now that you have Google Earth, you can begin by creating a folder in the Places panel in Google Earth devoted to your 16 couples. Here’s how:

1. In the Places panel, right-click on MyPlaces and select Add > Folder:

how to create a folder in Google Earth Layers panel for DNA

Right-click on MyPlaces > Add > Folder

2. Name the folder and then click OK:

Creating a folder in Google Earth

Creating a folder in Google Earth

3. Now you will see your new DNA folder for your 16 couples in the Places panel. If you don’t see it, look toward the bottom of the list. You can move the folder to any location within the list by dragging and dropping it. 

Create a folder in Google Earth for DNA 32 couples

Create a folder in Google Earth for DNA 16 couples

Once you have your DNA folder created fro your 16 couples, you can then easily plot your surnames and locations. 

How to Plot Your Surnames and Locations in Google Earth:

1. Click your new DNA folder to select it. This will ensure that the placemark you are about to create will be stored in that folder. 

2. In the search box (upper left corner of the Google Earth software) type in the first location and click Search. Google Earth will fly to that location on the map.

Type the locaton in the Search box and click Search.

Type the locaton in the Search box and click Search.

3. In the toolbar along the top of the screen, click the placemark button to place a pushpin in that location:

Click the Placemark button in the Google Earth toolbar

Click the Placemark button in the Google Earth toolbar.

4. In the Placemark dialogue box, enter a title for hte pushpin placemark. Click the OK button to close the box and set your placemark.

5. Repeat the process for all the locations. 

Then evaluate the fifth generation of your fourth cousin matches for genealogical information that lines up with any of the items on your list.

You can also plot the surnames and locations of your matches in Google Earth. This is where Google Earth really comes in handy. The free software makes it very easy to see when your ancestral home may be bordering the locations of your matches. Those with whom you find a similarity become your best matches, and your best chance of determining your connection. Those without an obvious connection cycle to the bottom of your pile for a genetic evaluation. You can perform these same kinds of searches for your second and third cousins as well.

As you begin to become more familiar with the fifth generations of your matches, you may also start to see patterns of surnames or locations emerge among your matches. These then become the surnames and locations that might be able to fill the missing spaces in your pedigree chart.

More Genetic Genealogy and Google Earth Gems

If you are new to using Google Earth, I have several suggested resources for you by Lisa Louise Cooke:

Premium podcast 131

Learn more in Premium episode 131.

Here’s a video of the authors discussing three common DNA misconceptions:

 

 

Authors: Diahan Southard and Lisa Louise Cooke

Episode 218 – It’s All About You

Genealogy Gems Podcast Episode 218

with Lisa Louise Cooke


In this episode, Lisa answers your questions and shares your comments. Hot topics on your minds that are covered in this episode:

  • discovering new records online,
  • working with other people’s online trees,
  • hard-to-locate military records;
  • and getting help with early Pennsylvania research

NEWS: GOOGLE EARTH STORIES COMING

“Google Earth to let users post stories, photos in coming years” at DNAIndia.com

Lisa’s FREE Google Earth video class: How to Use Google Earth for Genealogy

The Genealogist’s Google Toolbox, 2nd edition and Google Earth for Genealogy Video Series

Try Google Earth for Chrome (you must use the Chrome browser to access)

Download the free Google Earth Pro software.

The Genealogist's Google Toolbox Third edition Lisa Louise Cooke

Available in the Genealogy Gems Store

Video series available at the Genealogy Gems store

 

 

NEWS: FAMILYSEARCH REACHES 2 BILLION IMAGES

Why you should have a free FamilySearch account and use it!

How to use the FamilySearch Catalog (it’s free! Everyone should use it!)

Best strategies for accessing content at FamilySearch.org (special podcast episode on the end of microfilm lending)

 

GEMS NEWS: LISA’S NEW COLUMN IN FAMILY TREE MAGAZINE

Purchase the May/June issue in print or digital download format

Subscribe to Family Tree Magazine: print format, digital download format or get a great price for both!

StoryWorth for Father’s Day: Invite your dad to share stories with loved ones every week, and then get them all bound in a beautiful hardcover book at the end of the year. Go to http://www.storyworth.com/lisa for $20 off when you subscribe. This Father’s Day is actually a gift for you, too!

 

BONUS CONTENT for Genealogy Gems App Users

If you’re listening through the Genealogy Gems app, don’t forget to check out your bonus content for this episode! The Genealogy Gems app is FREE in Google Play and is only $2.99 for Windows, iPhone and iPad users.

 

MAILBOX: SARA’S FRIDAY RECORD POST DISCOVERY

Click here to view several recent Friday records posts and see what new records have appeared online lately!

Tell Lisa Louise Cooke about your “Friday records post” discoveries or anything else at genealogygemspodcast @ gmail.com or call the podcast voicemail at 925-272-4021.

 

MAILBOX: ONLINE FAMILY TREE MATCHES

Reviewing tree hints at Ancestry.com

 

MAILBOX: BACK TO RESEARCH AFTER 10 YEARS!

Lisa’s recommendations to a new Genealogy Gems Premium eLearning member for getting back into the swing of research:

Watch the Premium video, “Take Control of Your Family Tree” (Premium eLearning membership required)

Listen to the Family History: Genealogy Made Easy podcast by Lisa Louise Cooke. It’s a great series for learning the research ropes and well as refreshing your skills.

Listen to Lisa’s other podcast

Rootsmagic

Lisa Louise Cooke uses and recommends RootsMagic family history software. Visit www.RootsMagic.com

Lisa Louise Cooke uses and recommends RootsMagic family history software. From within RootsMagic, you can search historical records on FamilySearch.org, Findmypast.com and MyHeritage.com.

Backblaze

Keep your family history research, photos, tree software files, videos and all other computer files safely backed up with Backblaze, the official cloud-based computer backup system for Lisa Louise Cooke’s Genealogy Gems. Learn more at https://www.backblaze.com/Lisa.

 

MAILBOX: MILITARY DRAFT REGISTRATIONS

Click here to read about finding military draft registrations

 

INTERVIEW: JIM BEIDLER ON PENNSYLVANIA RESEARCH QUESTION

James M. Beidler is the author of The Family Tree Historical Newspapers Guide and Trace Your German Roots Online. Learn more Pennsylvania research techniques in his on-demand webinar download, Best Pennsylvania Genealogy Research Strategies.

Click here to read a summary of some of Jim’s tips AND find a collection of links we curated to help you find more Pennsylvania birth records online.

MyHeritage.com is the place to make connections with relatives overseas, particularly with those who may still live in your ancestral homeland. Click here to see what MyHeritage can do for you: it’s free to get started.

PRODUCTION CREDITS

Lisa Louise Cooke, Host and Producer
Sunny Morton, Editor
Hannah Fullerton, Audio Editor
Lacey Cooke, Service Manager

Disclosure: This page contains affiliate links and Genealogy Gems will be compensated if you make a purchase after clicking on these links (at no additional cost to you). Thank you for supporting this free podcast and blog!

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