Tag Archive | AncestryDNA

An elusive 2nd cousin match at Ancestry DNA

When you are a genealogist with an extensive family tree and you get a 2nd cousin match at Ancestry DNA, you expect to be able to find the relationship fairly easily. Never mind that this is my 2nd cousin’s once removed MM’s kit and that the new match has no tree, surely such a close match will want be in touch and know more?

2ndcuzmatch

The second cousin match (red arrow is mine showing where to click)

So I clicked on the View Match button. Sometimes there is is tree or two listed on the full match page that is just not connected to the DNA kit. No luck. Next I clicked on Shared Matches tab to see the matches MM had in common with this new cousin named A. The more relatives you have identified at AncestryDNA, the more useful this feature is.

viewmatch

Red arrow added by me to show where Shared Matches is

MM has my brother and a number of known Goodsell relatives in her match list at ancestry. MM’s paternal grandfather, Charley Wold, is the brother of my Wold great-grandmother Maren. He married MM’s grandmother Martha Goodsell, among a number of other wives. We have lots of Wold relatives who have tested their DNA, but all at other companies.

The shared matches showed that the new 2nd cousin A was in common with several Goodsell relatives but not a match to my brother’s kit. Now I lost interest since A was most probably not my relative. A second cousin on the Goodsell side would be descended from the parents of Martha, so I put this match aside for another day. However it is best to contact treeless folk as soon as possible after their data comes in, while they are still logging in and looking at their results.

There are a few reasons people don’t have trees. The main two are that they are adopted or that they did the test just to see their ancestry composition. So I always craft a careful message that lets an adoptee know that I am willing to help, but hopefully does not scare off those less interested in genealogy.

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When an Ancestry DNA green leaf is wrong

By Richard Weiss, Director of Programs, DNAadoption.com

Ancestry.com does a great job of finding common ancestors between DNA matches when both parties have trees. The layout is easy to navigate, intuitive, and well integrated, but sometimes the WRONG person or couple is shown as providing the shared DNA. This problem can occur when you share multiple common ancestors with a match but you or your match have have not yet found all of them.

Let’s look at an example of this.

In September 2016, I received a new match at AncestryDNA – B41. Based on a comparison of B41’s tree and my tree, Ancestry provided a “Shared Ancestor Hint” indicating that Barnabas Pratt was our common ancestor and that we were 5th cousins three times removed (5C3R) as shown below.

richardcaseb41

Figure 1: Ancestry’s “Shared Ancestor Hint”

Note that Ancestry’s “Shared Ancestor Hint” in the above image indicates that B41 and I match through my paternal side.
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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 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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Michelle’s AncestryDNA tips

No matter how expert you think you are, there is always something to be learned from others.
Michelle Trostler

When I saw that Michelle Trostler of DNA Detectives on Facebook and Identify Family was giving a talk on getting started with AncestryDNA for my local DNA special interest group, the North San Diego County Genealogical Society, I knew I should go, and I am glad that I did.

Personally, I use the Ancestry.com DNA testing service the least of the big three because all my ancestors are relatively recent arrivals (late 1800s and 1930s) so I do not have as many DNA matches there as elsewhere. Thus I know far less about using that site than the others.

Michelle is a knowledgeable and confident speaker. You can hear her at the upcoming i4GG seminar in San Diego as well.

Here are some of the tips from her talk that I found particularly useful.
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