My nephew is 22 months and can't share with other children, and is known to hit and get upset when expected to and grabs their toys etc. He is an oldest child, and doesn't see other childred on a daily basis. My SIL maintains that he is "too little" to know what sharing is, so doesn't really do anything about it. I have no idea what's normal though as don't have kids of my own so am interested in your views on what age should a child learn to share?