And I don't believe that children are innocent. In fact no one seriously believes that. Just go to a playground and watch the kids playing in the sandbox! The romantic notion of the sweet child is simply the parents projecting their own wishes.
I have one brother John an airline pilot who is seven years younger. He's adopted though we're still blood related - he's my cousin. My parents couldn't have any more children after me so when Dad's brother died they adopted John then just a baby.