The crossword solution for the term 'Napoleon Relatives' is TARTS, which stands for the four siblings of Napoleon Bonaparte: Joseph, Louis, Elisa, and Pauline. Joseph was the eldest brother and served as King of Naples and Spain, while Louis was the second eldest and served as King of Holland. Elisa was the only sister and served as Grand Duchess of Tuscany, and Pauline was the youngest sibling and served as Princess of Guastalla.