I am the mother of a 16yr daughter who has a mind of her own. All I can suggest is that you keep an open line of communication with them. Even if it is to talk about their friends, hobbies boyfriends, whatever it maybe on their mind, sit and listen to them. If something happens that you dont like, just be patient and trust in your teaching that they will make the correct discussion. I place alot of faith in my teaching and in god.