After charming an international audience, taking bestseller lists by storm with Having Our Say, and delighting theatergoers with the Broadway play, America's best-loved, bestselling sisters are back to warm the hearts of paperback readers with their feisty, down-to-earth advice and inspiring thoughts on faith, love, and self-reliance. 20 photos. IT'S AS IF WE'VE BECOME AMERICA'S GRANDMAS.' That's how Sadie Delany described the outpouring of affection and admiration that followed the success of Having Our Say, the best-selling memoir she and her sister published'