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Is this my Nephew's Aunt.Need help

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  • Is this my Nephew's Aunt.Need help

    I manage the kit for my Nephew who's mother is deceased so he can not test her, she is my half sister. He received a match (female A) that shows 1st Cousin, Aunt/ Niece 843 Shared Centimorgans and Longest Block 125 and also X-Match and he matchs her daughter (female B) and shows 1st Cousin-2nd cousin 452 longest 69 and also shows x match.My question is can I assume that she is his Aunt before letting him know.I also manage kits for his mother's other 4 half siblings and his match female A & B doesn't match them. Thank you for any help.
    Attached Files

  • #2
    Am I correct to assume his mother is a maternal half sister to you?
    If so, match could be a paternal 1st cousin (her daughter 1st cousin once removed) or a paternal Half Aunt who is a maternal sister to nephews father (fathers maternal half sibling, as his fathers X can only come from his mother)

    https://isogg.org/wiki/Autosomal_DNA..._version_3.jpg
    Last edited by prairielad; 16th November 2017, 10:26 AM.

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    • #3
      scrap that, Nephew can not have an X match through his fathers line, can only be through his mothers line, your half sister, her paternal line if she is your maternal half sister

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      • #4
        This scenario seems to fit, 843 match your sisters paternal Aunt
        Attached Files

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        • #5
          Originally posted by prairielad View Post
          scrap that, Nephew can not have an X match through his fathers line, can only be through his mothers line, your half sister, her paternal line if she is your maternal half sister
          Thank you for your reply.Yes she is my maternal half sister as we have the same mother.I am a male if that help shed light on it.
          As A and B doesn't match me are my other female siblings the match has to be through her father ?? If so would she be his aunt are his first cousin. Sorry but I am not so good at this even though I manage my nephew's kit

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          • #6
            Match would be through your Maternal half sisters father, likely candidate would be your Sisters Fathers Sister.

            Paternal Aunt to your sister (based on 850cM amount to your Nephew and X inheritance paths), if your sister was tested, her and match would probably share around 1700cM

            Edit
            I Assume you and your tested sisters only match your Nephew along that section of X that he does not match these matches. If so then it will also suggest your sisters(Nephews mother) paternal side.
            Attached Files
            Last edited by prairielad; 16th November 2017, 04:00 PM.

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            • #7
              Match can also be your Nephews Half Aunt, paternal half sister to your sister.

              Paternal half sisters will share entire X, so this maybe the reason he is matching with such a big section of X, he inherited most of his mother paternal X.
              Attached Files
              Last edited by prairielad; 16th November 2017, 04:40 PM.

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              • #8
                Originally posted by prairielad View Post
                Match can also be your Nephews Half Aunt, paternal half sister to your sister.

                Paternal half sisters will share entire X, so this maybe the reason he is matching with such a big section of X, he inherited most of his mother paternal X.

                prairielad I thank you for your help.

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