He seems like the last person qualified to give advice, but 10-year-old Alec Greven is the author of How to Talk to Dads (his third advice book) due out this week. His first book How to Talk to Girls—which made it to No. 49 on USA Today’s bestseller list last year—is “self-help for the playground set,” and his summa How to Talk to Moms came out last month. His secret? Just observe people. "Moms like clean kids," Greven says. “In some ways dads are tough. They don't let you quit, and they make you do things by yourself." And of the complicated opposite sex, Greven may have cracked the code: “Girls don't like desperate boys."