When my mother was a small child, she and my uncle were playing a game in which my uncle hurt himself. My grandfather took little Douglas to the doctor for a few stitches, promising his son that if he would just be brave and not cry, ice cream would be his reward. When the doctor finished, granddad took Douglas and Lila to the drugstore for ice cream. But when grandfather gave ice cream to little Lila, brave Douglas broke down sobbing, “Why does sister get ice cream? She didn’t get hurt!” Do you ever resent what others have, feeling they don’t ...