I like your article - it is important to remember that sharing is a learned behavior. My kids are 3 & 4 and they always assume I am willing to share with them! Which I am, of course, but now I point it out when they want a bite of my food or to see something on my iphone - "look, mommy is sharing with you because it makes me happy!" It seems to have an effect, and they are learning to share together, although the 4-yr-old has an easier time than her younger brother!