For those of you who might still be wondering how all this scientific DNA material helps us sort out very family branches, we'll try to present the associated data (as shown on the above-referenced spreadsheet) in a simple manner.
First, let's all accept the idea that everyone (76 individuals as of April 2015) in this Childers/Childress James River Viking project belong in the same "Clan" (clan being defined as having a common ancestor such as a grandfather, great grandfather, great-great grandfather, etc., within a genealogical timeframe of the last several hundred years). We come to that conclusion on the basis that, even for as few as 25 markers, our DNA markers are different from every other human being, but similar enough to each other to be considered "cousins." Maybe we have the same or similar surname and 23 out of 25 makers match; or, 32 out of 37, etc.
Now that we've all agreed that we're in the same clan, we have to try to find the common ancestors that allow us to further refine the branches in our common family tree. That's where the attached spreadsheet comes into play. It's really where the "rubber hits the road."
When you open one of the two formats below, you'll find a somewhat daunting display of data. However, you might be surprised to find out that we only have to show about 20% of the total data to determine, as best we can, how "family groups" are determined. That's because, given that we agree we all belong to the same clan, we can ignore all those Y-DNA markers whose value is the same for each participant. In fact, we also can ignore those markers where only one individual has a different marker to all the rest of the clan. So, all that's left are those markers (out of a total possible 111) wherein two or more participants have the same marker value that is different to the other 75 or so individuals in our clan.
Thus, the spreadsheet need only show marker values for about 23 markers out of total of as many as 111 Y-DNA markers.
To repeat, that leads us to the conclusion that a "Family Group" is defined when one or more James River Viking clan members have the same marker value which is different to all the rest of the clan members.
Pay particular attention to the orange number values as that is how we determine the above Family Group. Explanations are given on the right side of the spreadsheet.
Please feel free to contact a Project Administrator with questions regarding your participant's placement within a family group. This is a complex question, but can be answered with a reasonable amount of simplicity.
Click here to download an Open Document Spreadsheet covering all the current participants' marker values, along with conclusions reached by the Project Administrators....
Click here download the same data in PDF format...
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