Establish rules, curfews, and standards of expected behavior, preferably through an open process of family discussion and respectful communication. If your children get out of school at 3 pm and you don't get home from work until 6 pm, who is responsible for making certain that your children are not only safe during those hours, but are also engaged in useful activities? Where are they when they go out with friends? Are there adults around who are in charge? Supervising and monitoring your kids' whereabouts doesn't make you a nag; it makes you a parent.