 As such, Charles Louis would have the status of "Petit-Fils de France", with the style of Royal Highness.As his father is known as the Duke of Orléans, Charles Louis is known as the Duke of Chartres, the title traditionally given to the eldest son of the Duke of Orléans.He is the middle of three children, his elder sister being Princess Diane, Viscountess of Noailles, and his younger brother being Prince Foulques, Duke of Aumale.