Is it really fair that my sister doesnt want me to be in the car and mum is 100% on her side?

Do you have some kind of learning difficulties, or something? I don't mean to be rude but....okay, I guess I do mean to be rude, but it's still a valid question. I wouldn't want you around if you were my sister and there were going to be other people there either - you'll probably do something stupid and embarrass your sister.