Their loss is important. They are beginning to test their independence. They still need the security of knowing that the family is there for support when they need it, however. This is a trying time for most families. If children have been encouraged to make their own decisions and live with the consequences, good or bad, they will have less need to test the system.
Most youngsters are interested in the benefits of adulthood but try to ignore the responsibilities.
Part of a parent's job at this stage is to help children think through what might happen if various actions are taken. Do not try to make their decisions. This may encourage them to take a less acceptable alternative just to show their independence. Instead, give them options and let them choose. Then, let natural consequences follow.