u/Blackberry-Apple-13

As the title says, in 2020 I went to get tested to see if I could give my friend with renal failure one of my kidneys. I knew that I would be a match as I knew my dad’s blood type and then my mum’s parents (and subsequently my mum’s) blood type. I then was informed I wasn’t a blood type match as my blood type was one that wasn’t possible if my dad was my dad. (Also I do know there are very rare cases where blood type can be different to parents but this is definitely not one of them).