I have one annoying younger sister...Though I do not believe she has such a thing as a true purpose. All the things she does to annoy me, she does not do out of any purpose, she is just a highly annoying person who will never believe that she is in the wrong, no matter what the circumstances.
Oh yeah, and Cloud, you need to learn to say no...If your brother is paying you back, that's one thing. If he's not, then he's just extorting money from you, and that sort of thing should only be allowed on his birthday and Christmas.