Mr. and mrs. lee warn their new babysitter that their son, dennis, is very aggressive and mischievous and must be strictly disciplined. as a result, alison is over-strict with dennis and does not let him out of her sight. this facilitates dennis’ aggressive and mischievous behavior. this scenario best illustrates:

The babysitter used an aggressive style to handle the child's behavior. In effect, it made the child more aggressive and mischievous because he was overly restricted on doing his activities. 
But the best way to teach the child according to studies is assertive parenting. In this method, respect becomes the way to bridge the communication difficulty the parents have with their children. However, the child should still have consistent guidelines which they can follow.