What is the name of the Queen's sister in the series?

The Queen’s sister in The Crown is Princess Margaret. Margaret is Elizabeth II’s younger sister and the second daughter of King George VI and Queen Elizabeth. Although Elizabeth became monarch, Margaret remained a prominent member of the royal family and is portrayed as an important, often rebellious figure throughout the series.

The show presents Margaret’s relationships, ambitions, and frustrations within the restrictions of royal life. Early episodes focus on her decision not to marry Group Captain Peter Townsend, a divorced royal equerry. Later seasons depict her marriage to Antony Armstrong-Jones, the breakdown of that relationship, and her romance with Roddy Llewellyn.

The character is played by Vanessa Kirby in Seasons 1 and 2, Helena Bonham Carter in Seasons 3 and 4, and Lesley Manville in Seasons 5 and 6. Viewers sometimes confuse Margaret with Princess Anne, who is Elizabeth’s daughter, or with the Queen Mother, who is Elizabeth’s mother.