What's the list if we include members of the family who married in?
The complete list (to the best of my knowledge), including royals by marriage and former members (divorced spouses):
- The Duke of Edinburgh (born 1921)
- Elizabeth II (born 1926)
- Patricia Lascelles, Countess of Harewood (born 1926) *
- Marion Stein *
- James Carnegie, The Duke of Fife (born 1929)
- Katharine, Duchess of Kent (born 1933)
- Caroline, Lady Worsley (born 1934) **
- The Duke of Kent (born 1935)
- Princess Alexandra, The Honourable lady Ogilvy (born 1936)
- Prince Michael of Kent (born 1942)
- The Duke of Gloucester (born 1944)
- Princess Michael of Kent (born 1944)
- The Duchess of Gloucester (born 1946)
- The Duchess of Cornwall (born 1947)
- Margaret Rosalind Messenger (born 1948) ***
- Mark Phillips (born 1948) ****
- The Prince of Wales (born 1948)
- The Princess Royal (born 1950)
- David Lascelles, Earl of Harewood (born 1950)
* Widow of the late Earl of Harewood
* Former wife of the Earl of Harewood
** The former wife of the Duke of Fife
*** The former wife of the current Earl of Harewood
*** The former husband of the Princess Royal