 On 9 April 1952, two months after Princess Elizabeth became Queen Elizabeth II, she had declared that the royal family would continue to be known as the "House and Family of Windsor", as it had been under her father King George VI.This declaration was made on the urging of the then prime minister, Winston Churchill, who had long regarded the Duke of Edinburgh's uncle, Lord Mountbatten, as a dangerous and subversive rival who had sacrificed India, and did not want to see that name become the royal family's name.In 1959 the Queen announced she was pregnant (with Prince Andrew) and was due to give birth in February 1960.