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Have I been matched with a half sibling?

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  • Have I been matched with a half sibling?

    May I ask if someone would please explain what my test results mean and what steps I should take next, such as more extensive testing etc. I know nothing about dna testing and was gifted the ancestry test because I had interest in my ancestors from Scotland. The ancestry results showed a close family match. I have uploaded my DNA from ancestry onto gedmatch as well as Ftdna and all three have shown the same person as a match. He is my closest match second only to my mother. He was adopted at birth and has no knowledge of his birth parents. I am 45 and he is 41. We live within an hour of one another. We have several matches on my fathers side. None on my mothers.
    I have been an only child for 45 years.

    Thank you in advance for any assistance you are able to offer.

    FTDNA

    Relationship Range: Full Brother, Half Brother, Grandfather/ Grandson, Uncle/ Nephew

    Shared Centimorgans(cM): 2,021

    Longest Block(cM): 179

    X-Match: X-Match


    GEDMATCH

    One to one comparison

    Largest segment = 97.7 cM

    Total Half-Match segments (HIR) = 2067.6 cM (57.651 Pct)

    Estimated number of generations to MRCA = 1.4

    52 shared segments found for this comparison.

    513193 SNPs used for this comparison.

    60.789 Pct SNPs are full identical


    ANCESTRY

    2020 cMs

    58 DNA segments

  • #2
    Based on your data and lack of DNA sharing with your mother a half sibling from your father is the consistent conclusion.

    See the Shared DNA project for more information on DNA relationship ranges.
    https://thegeneticgenealogist.com/20...ed-cm-project/


    If your parents are still living you may want to get counseling advice before talking to them about this new family member information.

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    • #3
      Thank you. My parents divorced before I was born and my dad passed in 2014. My mom and I are both thrilled to find that I possibly have a sibling. Finally.
      Thank you for the link. Extremely informative.

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      • #4
        It seems very likely that you have the same father. If he is willing to take another test, I'd suggest Y-DNA with at least 37 markers.

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