I am a happy 16 year old. I am not spoiled but don't go without either. My family are happy and normal we are common and well off. I yet for some reason at the age of 14 smoked and drank with older boys and was a bit of a tart and just always caused an argument. Why?
What to look at?
The first thing to look at is are they happy with who they are? Does your son or daughter have insecurities? We may do things to fit in and to be accepted or to feel better about ourselves.
Next friends are they nice or off the rails?
We do things because we look up to our friends that do them and we misbehave because everyone else is.
These two things can be the very reason your son or daughter is misbehaving.
What can you do to help them stop.
Emotional blackmail is very effective in helping your child get themselves back to normal. No matter how much you think they have changed, they are still your babies and will still care about you. Try to talk to your child and be as understanding as possible.