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Match list comparison between cousins

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  • Match list comparison between cousins

    Ok, I am trying to understand something – 3 tests - my mother (E), her third cousin along her direct paternal line (K), and a second cousin(J) also sharing that paternal line.

    Both of E’s parents are ethnically Latvian. J’s mother was Latvian, but father Irish. Likewise, K’s father was Latvian, but mother Irish.

    J is also a “double second cousin” to E – his maternal grandparents are Brother Z and Sister A to E’s paternal grandparents – Brother A and Sister Z. So all 4 of J’s Latvian great grandparents are also ancestors of E.

    K shares only his direct paternal line with these two, 1 out of 4 of his Latvian great grandparents – Cousin A to the above Brother and Sister A.

    E’s autosomal matches seem fairly typical to many other ethnic Latvians (rural peasant farmers, Lutherans) I’ve explored. Under 200 matches with FTDNA, mostly local to the area.

    E, J and K only have a handful of common matches.

    Both J and K have over 1000 matches each, many of which being Eastern European but not necessarily Latvian, and many sounding very Jewish, with “Jewish” paternal haplogroup J-M---.

    Second cousin J even has another 10 matches that are predicted to be 2nd*or 3rd*cousins – as close to him as K and E - with Jewish roots that are nowhere to be found in K or E’s match lists.


    Is it possible the paternal line has a Jewish branch and E just didn’t inherit much “Jewish” DNA by chance?? Both J and K are DNA-predicted correctly according to the paper trail as 2nd*and 3rdcousins, so it doesn’t seem there is an NPE anywhere in the relatively recent past.

    Amongst 2nd*and 3rd*cousins, would you expect to find such different match lists??

    Those 10 other matches predicted to be fairly close to J could actually be more distant due to the whole Jewish endogamous population thing, no?

    In theory… I can assume that all of J’s Latvian matches are also E’s matches that just didn’t get picked up due to random recombination, since all 4 of his Latvian great grandparents are also E’s great grandparents… right?

  • #2
    So the obvious conclusion, that Irish and Jews are closely related is not what you are after ?

    When doing ICW for J and K, and excluding those matches they are sharing with your mother, what do you get ?

    W. (Mr.)
    Last edited by dna; 29 June 2015, 10:55 AM.


    • #3
      Hmm. In common with:
      E+K = J, a Russian lady with Jewish roots, and a Latvian man.
      E+J = K, 2 Latvians, and a handful (4 or 5) of Germans and Lithuanians (one shared line is suspected Baltic Germans)
      And finally, K+J = E, and two Americans of fairly mixed European backgrounds.
      That's it for common matches!!!


      • #4
        I would say you are against Central Europe admixed populations. And if they were more uniformly represented at FTDNA you would not surprised.

        W. (Mr.)