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AntonH
Norway Heritage Veteran
USA
9301 Posts |
 Posted - 14/01/2018 : 22:54:51
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quote:
He had purchased a Y-67 DNA test kit from ftdna (Family Tree DNA)
Are you sure he ordered a Y-67 DNA test. The data you presented above with the numbers are like this
Shared cM = 77.5418014526 with a longest block of 31.176410675
That data looks to me as if he has ordered an autosomal test. On FamilyTreeDNA that is referred to as a Family Finder Test.
If the grandson has data from a Family Finder test all of what I and Jackie have written is not applicable.
Here from FTDNA
Our Family Finder test focuses on autosomal DNA, which is inherited from both your mother and your father, your four grandparents, your eight great-grandparents, etc. This test is designed to find living relatives on all of your ancestral lines within the last five generations and can also give you a breakdown of your ethnic makeup by percentage
Family Finder Matches
Family Finder matches are other individuals in our database who have also taken the Family Finder test and who, through autosomal DNA comparison, are found to share a common ancestor with you from ANY of your ancestral lines within the past five generations. The names and emails of your matches, an estimate of how closely related they are to you, and any genealogical information they have uploaded are provided to you in order to collaborate on genealogy and get past genealogical brick walls.
If the grandson has obtained a Family Finder Test then you should also have access to a "Family Finders Matches Chart"
This may be the spreadsheet you are referring to as it contains the names of the matches, match date, relationship range ie 2nd cousin to 4th cousin, shared cM, and ancestral surnames.
Or the spreadsheet might be the Raw Data Page if that is the case have him look for the "Family Finders Matches Chart".
You might want to take a look at this link
Link
An even more informative article with pictures
Link
And more
Link
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Edited by - AntonH on 16/01/2018 22:52:30 |
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AntonH
Norway Heritage Veteran
USA
9301 Posts |
Posted - 16/01/2018 : 22:40:27
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Some other information for the Famly Finder Test from Norway DNA Norgesprosjektet.
DNA-testing for genealogy has three types of tests, and only two of these can find exact connections: Y-DNA and mtDNA which tests direct paternal and maternal lines. What is tested then is relation back to a common ancestor, not where these ancestors were actually from.
Autosomal tests (Family Finder) can find matches from all possible lines in the family tree, but the test is not exact, and the degree of matching varies greatly and has less confidence for each generation back. More than 6 generations back will only give random matches of all the possible relatives one has at that level.
If your ancestor you are interested in has several living desendants max 5-6 generations back (second great grandparents to the living), you can test Family Finder for all of them, and look for common gene segments. Preferably the tested people should not share other ancestors within 5-8 generations.
A challenge here is that people might have inherited common gene segments from further back, so it is impossible to assign a common segment to a specific ancestor without having complete ancestry trees for all ancestors far back (8-12 generations).
Not all descendants of the same second great grandparents will have inherited the same gene segments from that ancestor. This method can thus prove to be quite time consuming to use while also never giving a final answer.
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AntonH
Norway Heritage Veteran
USA
9301 Posts |
Posted - 26/01/2018 : 16:31:14
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Here is a useful tool that can hep you understand some things about the cM that you posted. It is called the Shared cM Project Tool.
Put your cM's that you share with your match in the box, and it will tell you what cousin range you will be in, and how many Great's back you should share
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Edited by - AntonH on 26/01/2018 16:33:18 |
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Christopher Christensen/Sophia Johnson/Twin sons
