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The original was posted on /r/biology by /u/alebbmic on 2025-06-23 21:09:54+00:00.

Idk if this is the right site to post this but idk were exactly to do it.

So my mom, my brother and me are all AB+, but my dad is O+. Is said in my family that we have something that makes us all have AB+ blood (at least the kids that come from girls, all this in my mom’s side), my grandparents were the same, my grandma is AB+ but my grandpa was O-, however all their 3 kids turned out AB+.

I don’t think they are lying with all this blood thing, is something I have been told all my life, and the lie would have had to last for all the generations in wich this has happened in my family, I’m definitely old enough that my parents would tell me if I’m adopted or smt, and cheating is out of the table, I look sm like my dad (and all the rest of the family looks alike. And my mom told my dad that their kids would be AB+ before they even tried having me and my brother.

Now I know that this is imposible, but idk if someone may have an explanation of how exactly this happens in my family, I repeat that is highly unlikely that they are somehow lying but I’m just so curious to know why all this blood thing happens.

Thanks for any help.