A Father wins a prize at a fair and has to decide which of his four children gets the prize

To try to find out he decides he will figure out which one is the best behaved child.

First he says, "ok which one of you has never talked back to your mom" they all just look at each other and say nothing

Next he says, "fine then, well then which of you has always done what your mom wanted when she asked?"

After this, the youngest child, clearly frustrated says "Fine Dad! you can keep the toy!"