Parents ar so much more experienced though. Reverse psychology works well even into the early teen years. How many parents fall for blatant reverse psychology. That's just one example of many techniques. Others include conditioning, reinforcement, outright education.
Most parents start out not really knowing much about the day to day details of being a parent. Your children learn really quickly how to achieve their aims.
As a parent the thing you do learn is to choose your battles. This is the cause of the eldest's lament that their parents were so much stricter with them than their younger siblings.
