" But twins are like that. They behave in ways, especially regarding each other, that can seem very strange to someone who is not a twin himself. They have a morality that is different from ours-at least when they are young they do-because, unlike other children, they are not inclined to imitate adults until much later. To children who are twins, even when they are not identical, the other twin is both more or less real than everyone else in the family, and they deal with each other the way that we deal with ourselves alone. Which means that it's like twins are permanently stoned. I don't think that's an exaggeration. "

― Russell Banks , The Sweet Hereafter