Monarchies surrounding Britain were falling fast in 1918, and King George V knew he needed to rebrand if he wanted to hold onto his throne. He changed the family name from the German "Saxe-Coburg and Gotha" to the quintessentially British "Windsor," and then sent his children out into the world to win over the hearts and minds of the British public. Thanks to newly released diaries and letters of the king's children, we go behind the royal facade to reveal secrets and untold family dramas.