Leaving nothing on the floor

An old war strategy when you have multiple enemies is to turn them on one another, let them annihilate each other and then swoop in a pick up the pieces. The equivalent to this for a parent is a play-date. For those of you out of the loop, a play-date is when you team up with another parent (as desperate as you to conquer their child) and have your children wear each other down to the point of complete exhaustion. It's awesome!!!