A sister is someone who will be your friend at some point, and be your biggest enemy the next point. She can take you to Micheal's in the morning, and lie to you the next. She may also blackmail you when you skip school, even though you spent the day with her. Also she will not buy you a Christmas present, or a birthday present; but she will buy a guy (that'st not her boyfriend) Ugg moccasins.
A girl who is very close to you. A girl who understands you like no one else can, and who can also relate to you. A girl who you are very close with, no matter what happens. A girl who you love, and she loves you back.