I truly believe that being a big sister is one of the most rewarding aspects of life. You get to grow up with a friend and you also learn how to be a mentor at a very young age. Even though younger siblings aren't necessarily sitting at your feet praising how much they admire you, it's kind of an unspoken truth. It amazes me that even at two, three years old, children understand the importance of being a good role model for their younger siblings. Now, I am not saying that having a younger sibling is the greatest thing ever. Don't get me wrong, its pretty cool, but it also comes with some backlash. Here are a few signs that you have a younger sibling (and that they drive you kind of crazy).