Tag Archive | My perfect cousin

Automatic Clustering from Genetic Affairs

My genealogy groups are buzzing with excitement about a new tool from Genetic Affairs to automate the clustering of your DNA matches. This takes the Leeds method concept to another level.

Everyone is posting pretty cluster pictures like the one below that I made for my perfect cousin, the star of many of my blog posts. This is a table where each DNA match is listed on the top and side; then if they match each other, the box is colored in with the color for that cluster. The chart is sorted by cluster. The idea is that each colored cluster shows descendants from a probable great grandparent couple of yours.

The gray boxes show where people match others outside the cluster which can often happen when families intermarry more than once or when they are first cousins enough times removed to have been in the second or third cousin group by DNA but are related to more than one set of great grandparents.

Automated clustering is useful because it puts your DNA relatives who are related to each other into visual groups so that you can quickly see which line a new match is related on. The picture is pretty but the workhorses are the charts for each cluster shown below that image when you scroll down. Here is the privatized one for my “perfect” cousin showing our MUNSON cluster.

Each name can be clicked to go to that Ancestry match page plus much useful additional information is shown next to the username: how many cMs shared, how many matches shared in the whole group, cluster number, how many people in their tree, and the notes you made for that match.

The image and charts are from the HTML file which arrived via email from Genetic Affairs after I requested automated clustering for my cousin’s Ancestry profile, which is shared with me there. You have to save the html file to your computer and then click on it to view it. When it first comes up, it is a mish-mosh sorted by name, but then it resorts itself by cluster. Fun to watch. Click here for the step by step of how to use this tool from the Intrepid Sleuth. It can also cluster matches from other sites like 23andme.

I decided to try it on an unknown father case I had not gotten around to working on yet, to see if it succeeded in speeding up the process and it did, to under an hour! A new record.

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The Power of Ancestry DNA circles

My cousin DM got a new 3rd cousin match, DB, on her Ancestry.com DNA page that was listed in two of her DNA circles even though those ancestors did NOT appear on that match’s tree! Wow, is ancestry really able to make this call just from the DNA? There is no shared ancestor hint with my cousin. (By the way, each member of the couple who provided the DNA gets their own circle; in this case Sigri and Bard Nelson.)

After looking at DB’s tree I see that he has a Selmer Nelson on his tree who is a known descendant of the couple Bard and Sigri Nelson(Nielsson) who make these two circles. So he clearly does belong and his tree just does not go back that far.

Using the shared matches tab on this match’s page, I find that this new match, DB is in common with yet another match in these two DNA circles, BK with whom he is more closely related; they both have Selmer Nelson as a grandfather. BK does not have a green leaf with my cousin JM because he has spelled Bard Nelson and Sigri differently.

However BK is also a shared match with DK who DOES have a green leaf DNA ancestry hint with my cousin. DK shares Selmer’s dad J.B. Nelson with DB and BK. Aha, perhaps that is how this was figured out. Both BK and DK have Bard Nielson in their trees but DK spelled it the way we did. Now perhaps I understand how Ancestry put DB and BK in these circles! Continue reading

Taking it to the Next Level – DNA Spreadsheets

Perhaps this post needs the subtitle , “My Perfect Cousin Goes to GEDmatch.”

Most of us can keep track of information in spreadsheets. So how to do that with DNA? Well, the idea is to keep a list of matching DNA segments so that a new match can be compared to your known family members. That way you may be able to see where they fit in.

If you have tested at 23andme or Family Tree DNA, you can download your list of matches with their matching DNA segments either directly from your testing company or by using the tools at DNAgedcom. However AncestryDNA does not provide a list of matching segments.

Extract from my Dad's MasterSpreadsheet

Extract from my Dad’s Master DNA Segment Spreadsheet (click for a larger version)

Why would you want those? The short answer is to figure out which line a new DNA cousin belongs to. For the long answer, read on. For more posts about DNA spreadsheets click here or in the tag cloud, lower right hand column.

tier1smll AncestryDNA testers can make a DNA segment spreadsheet by using any of a number of utilities at the GEDmatch web site. Start by uploading your raw DNA data (click here for that “how to” post). Your results will usually be ready for full comparisons the next day. Then buy the tier 1 utilities for at least one month ($10).

My preference for making a first spreadsheet is to use the Tier 1 GEDmatch Matching Segment Search. Then I go through the top matches from the ‘One-to-many’ matches report with that spreadsheet as a reference. I add notes on what I discover to my new spreadsheet.

Here is the step by step of what I did for my perfect cousin J.M. whose AncestryDNA results I blogged about in my previous post.

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My Perfect Cousin

This is the first time I have had a cousin’s DNA test come out showing an ancestry composition that was 100% a single ethnicity. My cousin J.M. was not in the least bit surprised as she expected to be all Scandinavian. Five of her eight great-grandparents were born in Norway and the other three were born in the U.S.A. to Norwegian immigrants. But I was quite surprised because there is usually at least a trace of something else.

jmethnicitysmllShe shares my Norwegian born Munson (Monsen) great-grandparents as her great-great-grandparents making us 2nd cousins once removed. She tested at AncestryDNA to help me figure out where a related adoptee might fit in (no luck on that). The fact that she has a genetic genealogist for a cousin who would tell her what it all meant helped convince her as well.

I usually send cousins to my page comparing all the autosomal tests and let them choose. However I prefer Ancestry.com DNA testing for the interested, but non-genealogically serious, relatives who are online because it is so easy to see the relationships and use the green leaf hinting system. Also I was tired of having only one circle and her test would give me a second one. Those with colonial ancestry have plenty of circles and NADs (New Ancestor Discoveries) but we recent immigrants (1870s and 1880s) are lucky to have any. Last but not least, it was the cheapest test at the time she ordered it.

Now why is she perfect? It is not just the 100% Scandinavian but amazingly her top four matches are all second cousins from different pairs of great-grandparents! I have never seen that before either. Of course most of my tested relatives being from relatively recent immigrants, have no second cousins and almost no thirds showing at Ancestry .

Here are J.M.’s matches:

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