When Alana Best and her husband, Roland, decided to travel for a year with their kids, she imagined soaking in sunsets over foreign lands, marveling at monuments she had only read about in books, and savoring culinary delights. And there was that . . . but what she had not prepared for was how the world would treat their biracial, blended family-or how that experience would force her to come to terms with her white privilege and prejudices.