text: Call your local authorities (sheriff, police, etc). Contributing to the delinquency of a minor is a pretty serious offense. You need to make sure you have your facts straight first, though. You don't want to make false accusations. I would be very angry if my child had been serve alcohol too, but you need to know if it was just a sip or possible a drunken party. Then, make a decision whether to start a legal ruckus or simply have a stern talk with your child.  Best of luck to you.