Sadly another horrible evening! My 13 yr old dd just seems hell bent on an argument every night. I am so worn down with it. I just do not know what to do anymore. She is vile to her siblings. This evening her 5 yr old brother wanted the loo but for some reason she stopped him going into the bathroom upstairs as he was getting ready for bed and was forcing him downstairs alone which he does not like to do. I intervened and she was just so rude. She has 3 siblings none of whom behave like this. I just don't know anymore. I want her to be happy. I want us all to be happy! If it was occasionally it wouldn't be so bad but it is every single night. Any ideas/suggestions please.