I am at my wits end! My daughter is 13, and she is behaving like a tyrant! She is bad tempered, short tempered, disrespectful, and generally horrible to live with. Every weekend is hell at the moment, and I don't know what to do with her. She speaks to me and her father as though we are idiots, and she makes fun of her father too, which upsets him. (then says she was 'only joking'). On Friday night she was awful, and then went upstairs and put some pink substance in our bed. The worse of it is that, next morning when we asked why she did it, she lied and swore that she didn't. She is not pleasant to be with anymore, and I'm afraid I don't like her much. I wouldn't have dared to behave like this when I was her age - I really don't know what to do.