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The original was posted on /r/tifu by /u/cyaniluv on 2026-06-23 15:10:22+00:00.

My mom died recently and I checked old passports for pictures of her. It contained an allergy thingy where I could see her AB- blood type. I did pay attention in biology so I realized pretty quickly that I either didn't have O+ or we were in fact not related .

So i tried to find the documents where it was (I couldn't ask my mom where they were and some parts were messy so I just resorted to calling my dad considering his confirmation would resolve it with ease. Which he didn't give low-key suspicious. My twin digged a bit more so he called me revealing the truth they went to a fertility clinic in Barcelona. My mom was infertile due to endometriosis so they had an egg cell donor there. I did realise I resembled my dad more but I would've never come to this conclusion without seeing such proof. As long as I can pass off as related to her I probably will my father said they screened a donor based on resemblance so I will probably continue mentioning Latina instead of Spanish but without the disclaimer of the fact that my Chilean family is fully German genetically. And I should respect the wishes of keeping this entire matter a secret from the rest of the family even though it does feel weird to understand why I bear 0 resemblance to my cousin.

TLDR don't know biology and go digging around in documents if you don't want to uncover secrets like this. I sure hope she raised me to be a baddie like her even if I don't have her DNA.