sentences:  During World War II, Louis attempted to keep Monaco neutral, although his sympathies were with the Vichy French Government.This caused a rift with his grandson Rainier, his daughter's son, and the heir to Louis's throne, who strongly supported the Allies against the Nazis.Following the liberation of Monaco by the Allied forces, the 75-year-old Prince Louis did little for his principality and it began to fall into severe neglect.