Can Two Kids Ever Be In the Same Mood?

The above photo illustrates the theory that for every (positive) action there is a (negative) reaction.

I am of the mind that when everybody is in a good mood that the family should celebrate -- for it seems that having a moment when everybody feels pretty good is rare. I suppose I exaggerate, but it often feels that way.

Something in kid psychology makes the good mood of one the fuel for negativity for the other.

Also, when both kids are super excited and running around shrieking with unbridled joy, my head hurts ( I, too, figure into this equation).

Life is good so I don't want to complain too much, but the seesaw of up and down inversely correlated moods is a challenge.