There is no point in childish argument. You could easily get into a blame game which leads to nothing but disagreement and ill feelings. If there is negativity, identify the problem and look to resolve it..
Was just remembering a book I read called "All I really wanted to know, I learned in kindergarten"..
Play fair, clean up your own mess, say you are sorry when you hurt somebody, when you go out into the world hold hands, look..
And it's so true that we learn all the basic and most important lessons of life when we are young. Yet those are the very things we have to be re-taught at every step in life..