Her Majesty had one sister, Princess Margaret Rose, who is now deceased. HM Queen Elizabeth II (b. 1926) had one sister, Princess Margaret Rose, who was born in 1930 and died in 2002. Princess Margaret married (in 1960) to Anthony Armstrong-Jones, and they were given the title of the Earl & Countess of Snowdon. They were divorced in 1978, and had two children, David and Sarah.