The Shared CM Project Tool 4.0

-


Courtesy of Pixabay


Mystery Match - What To Do Next

You've checked your DNA results, possibly at a new test company, and you find an unfamiliar match sharing a large segment of DNA. While some of the companies assign a relationship, "1C,2R", that may not be accurate due to variables such as "half" siblings or cousins.  There are several tools available to help calculate relationships; one we have seen in presentations and online is the Shared cM Project 4.0 Tool v4. https://dnapainter.com/tools/sharedcmv4







You can locate yourself in the white square marked "Self" just off the center.  Relationships that share, or are descendants of one or both of your parents are in light or blue gray.  Relationships with which the most recent common ancestor (MRCA) is one or both grandparents are in green, great-grandparents are in orange.




The numbers in the squares represent the average shared cMs for that relationship as well as the low and high range.  Notice that ranges do overlap so it is also necessary to check family trees in order to make accurate assignments.




Where do we find the shared cMs?  Your testing company supplies that information as well as a "best guess" at your relationship with a match.


Ancestry:










and the same two individuals from My Heritage:




The shared cMs are similar in range and percentage but My Heritage gives more possible relationships.  



23 and Me




23 and Me give the shared cMs as percentages and, while they give a relationship, again there are variables.

Shared cM Project Tool works with all tests

At the Shared cM Project tool, you can enter either the number of shared cMs or the percentage in order to get the range of possible relationships.























If you enter the shared cMs as a percentage, you get the following information:

















and a chart with highlighted probable relationships:



Be sure to look carefully at all of the possibilities; don't overlook possible half relationships.



MaryLynn Strickland


Comments

  1. DorothyNovember 28, 2022 at 2:11 PM

    MaryLynn,
    Thank you for this article. The next step could be using the new tool, The Shared cM Project 4.0 tool v4 with option to add a second amount, at https://dnapainter.com/tools/sharedcm-double

    ReplyDelete

Post a Comment

Popular posts from this blog

Looking for a Needle in a Haystack? GAME CHANGER at FamilySearch

-
Image
Generated with Bing ImageCreator (AI), March 13, 2024 Where is YOUR Needle, Your Missing Record? Genealogical Proof Standard When we use the GPS (Genealogical Proof Standard) as our guide, we all know that "exhaustive research" can be both tedious and exhausting. Is life long enough to search page by page through all the counties where all the members of a family might have lived, paid taxes, bought, leased or sold property, made a will or died intestate? It is possible that the new Full Text Search at FamilySearch will  eventually  allow us to do just that. It has been estimated that 75% or more of the records at FamilySearch were browsable but not searchable; the only indexes those found in the records themselves. Those records are certainly attainable by using those indexes and browsing to the record of interest, but the process is tedious, often frustrating, and slow. And once found, the record must be read and transcribed to be useful. This new Full Text Search tackles a...
Read more

What's the Question?

-
Image
We genealogists are often told by experienced researchers how important it is to begin with a research question. I resisted doing this for a long time, but now that I use a series of questions to guide my research, the search is more focused and actually finds more of the history of the family I'm investigating. I use a Google Doc as the  research proceeds, where I keep the question(s), the plan, timelines, checklist of resources to search, etc. all in one place. I've seen others use spreadsheets in the same way, perhaps splitting up things in tabs (Excel or Google Sheets). I prefer a document because I add source citations as I find them and I can begin writing up the case right there in the doc as the hypotheses are proven. Specific Questions in Previous Successes As beginners we often have no clue how much and what details we already know about a person, event or relationship, so it's hard to specify what we want to know. But when looking back at successful research, it ...
Read more

Help Save This Abused and Neglected Cemetery

-
Image
Screen capture from Google Maps History In an exchange of emails this past week in both the main SKCGS group, and in the Washington-State-Genealogy group, many facts were revealed about the history of the I.O.O.F. Comet Lodge Cemetery, also known as the Old Burying Ground, the Georgetown Cemetery, the Graham Street Burying Ground and maybe more.  FindAGrave sums it up this way: "Since it was established in 1881, the Comet Lodge cemetery site has been whittled away to less than half its original 5 acres. Records are sketchy but it's safe to say that some 500 pioneers were buried here, atop unknown numbers of native Duwamish people. New burials ended in the 1930s. Since then, homes and streets were built on top of many of the plots as the neighborhood around the cemetery grew.  "Upkeep and ownership of the cemetery bounced between the city, civic groups, relatives of Comet Lodge residents, and nearby neighbors. For years, much of the property was allowed to deteriorate int...
Read more