Attending a cocktail party at the home of Lily Kanter—CEO and one half of the eponymous design brand Serena & Lily—is very much like stepping into the pages of one of the company's carefully curated catalogs: welcoming, warm, and cheerful. Nothing has been overlooked. There are stacks of neatly folded napkins; an artful spread of well-designed crudités, mingle-friendly skewers, and spring rolls; and a fully stocked bar manned by what are arguably the cutest cocktail slingers in Northern California: Kanter's young sons, ages 8, 9, and 12. "They're very good bartenders," she says with a laugh. "They know how to make a great martini."