There was one piece of birthday cake left. The newly minted 6-year-old felt entitled to that piece of cake. After all, it was HER birthday. Her 3-year-old sister was thoroughly unmoved by any sense of rights or entitlement. She wanted to be a part of anything her sister did. She wanted to belong rather than feeling left out. Indignant cries of “it’s not fair!” would echo throughout the house if she didn’t get any of that last piece of birthday cake when her sister did.