1. "Your sister is better than you at [fill in the blank]."
Maybe you’re trying to motivate one grandchild to try harder, but pointing out her sibling’s Serena Williams-style tennis serve isn’t going to push her to ace her own next serve, says Jodi R. R. Smith, author of The Etiquette Book: The Complete Guide to Modern Manners. Children want their grandparents to be judgment-free cheerleaders.
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