George VI & Family
George VI, shortly before he died, with his family. Queen Elizabeth, his wife and later Queen Mother is on the left in this photo with Prince Charles. Next to her is Princess Margaret, with Prince Philip at the back. Princess Elizabeth, the present Queen, is standing by the pram in which sits Princess Anne.
The flowers in the background and the clothing, together with Anne being in a pram (she was born in August 1950), suggests to me that this photo was taken in the spring of 1951.