Bruce Feiler and his wife have twin daughters, and every morning was a madcap rush to get everybody out the door on time. Feiler kept wondering if things could be better — easier, smoother, happier. So he set out on a mission to gather advice for how to build a stronger, happier and healthier family. The result is The Secrets of Happy Families, a collection of more than 200 strategies culled from conversations with, among others, business branding experts, sports coaches and even the team behind Modern Family.