Rascal Flatts member Jay DeMarcus and his wife, Allison DeMarcus, discuss their new show, "DeMarcus Family Rules"; Courtney Rich, Cake by Courtney founder, prepares a Scandinavian wreath cake; Maria Provenzano makes DIY light up peppermints; lifestyle expert Brandi Milloy presents a holiday gift guide; Christopher Kimball (book, "Cookish") makes a pork sweet potato and cabbage stew;