(1) telling her to shut up does not work .. it makes my sister louder. (2) You can't be mean, she'll "tell" on you. (3) ask her what she'd feel like if she were you. Say your doing math homework and she wont stop singing and yelling beside you.. ask her how'd she feel in the same position. I feel that this helps more than yelling at them and causing problems .Try to keep calm, because it's not worth the consequences.