Happiness is not something someone gives you, it is a state of mind that is created by you. If we believe that our happiness is controlled by others then we are at the whim of their words and actions, and our happiness can, therefore, be as changeable as the weather.
My daughter is not the source of my happiness but, she reminds me, through her actions, what it looks and feels like to be in a true state of happiness. Children are born with a sense of knowing about truth, they are still close to the source and are not yet conditioned by society, which can move us away from our happiness. There is so much we can learn by simply observing them.