What are we talking about here?
There are so many factors that go into each individual kid (chinuch al pi darcho). They’re running away from you in the street or they’re not putting the milk back in the fridge? They’re 2 or 22? Sometimes its an issue sometimes its not and a parent needs to know the difference, irrelevant to their own ego (its tough sometimes).
All that being said, one way, and note it takes time and effort, is for the parents to set a good example. If Mommy treats Totty with respect and Totty does everything right away Mommy asks kids will learn that is the proper way to act. Same goes with parents and in-laws.