Some people firmly believe that blood is thicker than water and that family is the most important thing in the world. What happens, though, if you view your friends as family? Where do your loyalties lie? A frustrated sister recounts her experience in the story below. OP and her sister were never very close. Since childhood, OP's sister has been told she is the more attractive and successful of the two. But as soon as the girls entered high school, OP's sister got pregnant by a mysterious man.…