Picture a middle-class American family, four generations, living in the suburbs. ... Give or take a few details, this extended/blended/fouled-up family could be any of ours. That makes it cliché territory, risky for an ambitious novelist. It’s also quintessential Anne Tyler, as well as quintessential American comedy. Tyler has a knack for turning sitcom situations into something far deeper and more moving. Her great gift is playing against the American dream, the dark side of which is the falsehood at its heart: that given hard work and good intentions, any family can attain the Norman Rockwell ideal of happiness — ordinary, homegrown happiness.