I guess the Queen must be one of the last 3 to have George V's family Order. ( Princess Alexandra & The Duke of Kent may have one too).
Wikipedia says that Alexandra was that of George VI and EII.
" The Queen herself wears the Family Orders of her father King George VI and her grandfather King George V; she does not wear her own. Princess Alexandra has those of King George VI and The Queen. Those who wear that of The Queen only are The Countess of Wessex, The Princess Royal, Zara Phillips, The Duchess of Gloucester and The Duchess of Kent. The late Queen Elizabeth, the Queen Mother, wore those of King George V, King George VI, and The Queen. The late Princess Alice, Duchess of Gloucester, also wore those of King George V, King George VI and The Queen. The late Princess Margaret wore the same as her mother, Queen Elizabeth, the Queen Mother. The late Diana, Princess of Wales wore that of The Queen only."
Sarah, Princess Michael and now Camilla apparently didn't receive the Order.
Brnbg--thanks about Ella.