A younger brother has little choice but to look up to his older sister. She's taller than he is, for one thing. She has many developing talents, ranging from karate to violin. And she knows so many things: How to make the living room into an adventure land. How to dance. How to grow gumdrops. Well, maybe her understanding of the world isn't perfect, but she's pretty impressive, leading Little Brother to call her "Me one" and himself "Me, too." Big...