Does anyone have advice on how to 'deal' with what used to be a loving and normal pre teenager and now (14 yr old girl) answers back a lot of the time and gets in a strop about the smallest of things and seems to have no sense of humour. I have a 16 yr old son aswell but didn't seem to have had the same problem with him. He's actually a big help in difficult situations as he has a very good sense of humour. It's difficult getting the balance right with a) letting things go and b) setting boundaries and enforcing them without resorting to shouting. What is safe to 'let it go' without her turning into an unpleasant adult. Does anyone have experience of teenagers.