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3rd Cousin Match - Sibling or Cousin To My Great-Grandmother

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  • 3rd Cousin Match - Sibling or Cousin To My Great-Grandmother

    Good Day Everyone,

    I have a question to ask. I have a match to BOTH my father and his mother (paternal grandmother) to a person that FTNDA has a suggested range of 2nd to 4th cousin. The suggested match is a 3rd cousin to BOTH my dad and grandmother. This match has the following data:

    Matched To Grandmother
    Shared cM - 65.13
    Longest Block - 42.96

    Matched to Father
    Shared cM - 62.02
    Longest Block - 42.96

    I am trying to determine if my grandmother's mother - Addie Ruth Johnson - is a full cousin or half sibling to the ancestor of the person that my dad/grandmother matched to? From my paper trail, the ancestor of the person that was match would be either a sibling or cousin to my great-grandmother Addie Ruth.

    Can I determine this from DNA data already known or would I need more information?

    Thoughts please.

    Thanks
    Steve
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