The child of this age to a parent's any advice can hold defensiveness, then you should worry about is parent of communication problems. Adolescence is the period, established own values parents should first understand no value standard is absolutely correct, so should respect child personal value orientation, if you think is wrong, and there is no need to any preaching, because this period has not in childhood that children with parents have a worship consciousness, you should try to tell their children who hold what value criteria, these people also in what kind of environment, and in the tell him you held by the view, as he should do that's his own things, should by his own solution.