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Thread: Blood Type Paternity

  1. #1 Blood Type Paternity 
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    My father was blood type AB. My mother died young so I don't know her blood type. Two of their 3 daughters have blood type AO but the oldest is blood type O. From everything I've read the blood type AB cannot produce an blood type O offspring no matter what the mothers blood type. I am one of the type A daughters & my type O sister looks very much like me & I am the spitting image of my father (except that she's 5"3" & I'm 5'10"). She is actually the one who told me to verify this. Is it possible that she is his natural daughter? Thanks for your input.


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  3. #2  
    Forum Professor jrmonroe's Avatar
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    Cis AB


    sculptor likes this.
    Grief is the price we pay for love. (CM Parkes) Our postillion has been struck by lightning. (Unknown) War is always the choice of the chosen who will not have to fight. (Bono) The years tell much what the days never knew. (RW Emerson) Reality is not always probable, or likely. (JL Borges)
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  4. #3  
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    Thanks for the great info. This will satisfy her for an explanation. Is Cis AB the same as Bombay syndrome or are they 2 different conditions? As far as I know we have no Asian ancestors.
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    Forum Professor jrmonroe's Avatar
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    I'm not sure, but if they were the same condition, I think Wikipedia wouldn't have two articles about the same thing. At the end of the "Scenarios" section in the Cis AB article in Wikipedia, there's a comment about Bombay syndrome that may explain how they're related. I don't know much about this.

    The resemblance between you and your sister could be from your mother's side, but you know better about that. Even if it's definitely from your father's side, certainly there's other men in his family, but then that questions people's reputations.

    A DNA test of you and your sister should solve this mystery. You said your father WAS blood type AB, which sounds like he passed on, so there's no way to test between him and your sister.
    Grief is the price we pay for love. (CM Parkes) Our postillion has been struck by lightning. (Unknown) War is always the choice of the chosen who will not have to fight. (Bono) The years tell much what the days never knew. (RW Emerson) Reality is not always probable, or likely. (JL Borges)
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  6. #5  
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    Thank you for your help. I think I will test my DNA thru Ancestry. I don't think my Type O sister will want a DNA test. She is in her mid sixties & is completely satisfied with the Cis AB condition. Maybe some things should remain a mystery.
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  7. #6  
    Forum Masters Degree mat5592's Avatar
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    Bombay is very different than Cis AB. Also, your mother would have to be AO for this to be plausible. Additionally, Cis AB seems to be very rare.
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  8. #7  
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    I am AO so it is possible that our mother was as well. My sister is aware of the simplest explanation for her blood type, but at her age (67) all roads lead to the cemetery. At this point, she is choosing Cis AB as the explanation. I don't blame her. We all adored our father.
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    Forum Masters Degree mat5592's Avatar
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    Quote Originally Posted by tss46737 View Post
    We all adored our father.
    And that is all that really matters.
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  10. #9  
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    Thank You
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