The Youngs, the Redstones, and the Yees are families who are lucky enough to live in three of the nation's most vibrant -- and most visited -- cities. So what do they do for fun?Here, they spill the beans on their favorite spots and pass along valuable insider tips on kid-friendly places to explore, shop, and eat in Washington, D.C., Chicago, and San Francisco -- and recommendations for family-friendly lodgings.
