Katharine Worsley married HRH The 2nd Duke of Kent at York Minster on 8th June 1961. Later that year she receied the Royal Family Order, with the badge in size 2.
The later recipients of the Royal Family Order of Elizabeth II were:
1961 - The Duchess of Kent (wife of HM's Cousin)
1969 - The Princess Anne, later Princess Royal (daughter of HM)
1973 - Princess Richard of Gloucester, later Duchess of Gloucester (wife of HM's cousin)
1982 - The Princess of Wales (wife of HMs eldest child)
2004 - The Countess of Wessex, later Duchess of Edinburgh (wife of HM's youngest child)
2007 - The Duchess of Cornwell, later Queen Camilla (second wife of HM's eldest child)
2017 - The Duchess of Cambridge, later Princess of Wales
Size one badge, belonging to Queen Mary, later worn by Princess Margaret.
Size two badge presented to HRH Princess Alice Duchess of Gloucester at Christmas 1952.
The badge design followed the format of King George VI's Family Order. However, the 18 brilliants were in six groups of three, each divided by a baguette. The portait of the Queen wearing the George IV diadem and the Cartier necklace from the Nizam was based upon a photographic portrait by Dorothy Wilding.
"Her Majesty The Queen's Family Order, again made by Garrards, was bestowed by her at Christmas 1952 on ladies of the Royal Family. Subsequently it was given to some who had married into the Royal Family and to the Princess Royal, for whom a new badge was made in 1969."
Patterson, Stephen (1996). Royal Insignia: British and Foreign Orders of Chivalry from the Royal Collection. London: Merrell Holberton. p. 142. ISBN 9781858940250 .