Princess Eugenie and her husband, Jack Brooksbank, have announced the birth of their third child—a daughter, who joins their sons, August (who is 5) and Ernest (aged 3). So, does this mean that the new royal baby is British, Portuguese, or a dual citizen? Add to Google settingsIs Princess Eugenie’s new baby girl a British citizen if she was born in Portugal? “Nationality for British nationals is defined by the British Nationality Act 1981, where nationality is determined by the nationality of the parents,” he says. “There are special rules around children being born abroad and whether their children are entitled to British nationality or not.”