If you are adopted or illegitimate you still have two parents that love you, right? I'm adopted and when people ask me about my real dad I say "he's right here" pointing to adoptive father. ^^

I read up on this and it seems that if one parent was OB that there is a one in four chance of you being B. Other factors are also organ transplants that can change blood group especially bone marrow. Or it may be your parents have no idea. But there are other reasons than the general norm, like one parent being OB.

I vote mutant.

Maybe you're mom made you with another man who had B blood type or something. Either that or you're most likely adopted

well also ur dad xould be somebody different.

Mutant

#307: that's what illegitimate means idiot OP: WTF, that's messed up! fyl...

eeee mommy might have not told daddy something!

I'm a third yr genetics major (so don't declare I'm wrong coz you high school bio teacher says so) It's possible that your mum has a rare recessive mutation that affects the protein that attaches the A/B antigen to the cell. So you mum could be B or AB but because the antigens don’t attach to the cell membrane they can't be detected and she appears to be O even though she's not. Or she could be bombay If you want to know you should ask you mum privately coz if she didn’t cheat you’ll ruin her marriage

use ur mutant powers to puke all over your parents