Lucy is your very gifted little sister. Your parents favor her over you because of how smart she is. She is a brat and is very snarky and sarcastic. Even though you are the older one, she is a grade above you

You walk into your house after school, and see her sitting at the table doing homework. It seems harder then the homework you get, but she seems to be doing great at it. She then glances up at you "Oh. Well, Hello there, Older Sibling."