My parents were both black haired, olive skinned, rotund midgets who had ten children. Eight of the ten are clones of mum and dad, but me and one brother (a consecutive sibling) are tall (I'm 6ft, he's 6'5), slim and fair. Our eldest sister(witch!) has insinuated we are the result of mum having an affair. As both parents are dead, we'll never know.
I personally couldn't give a stuff, but my brother is eaten up over the subject so I would have liked to have asked for the truth for his sake.