My six year old daughter's behaviour at home is terrible. She won't do as she's told, back chats and makes us late for school every morning and bedtime is a total nightmare. She insults us and says dreadful things to us just because we tell her to get ready for school. I start work every day feeling tearful and dread going home. My life is a misery and it's tearing our marriage apart. She does well at school and behaves impeccably there. I really need some support but don't know where to turn.