@aftershocks, I'm not clear who Edward & Katherine are. Is that QEII's youngest son? And who was the young boy sitting with the Queen & Prince Phillip? Anyway, I love her wedding dress. That was fabulous.
Prince Edward, Duke of Kent is the oldest son of Prince
George, Duke of Kent (who died in a plane crash during WWII). Prince George was a younger brother of Prince Albert aka King George VI, so Prince Edward Duke of Kent is Queen Elizabeth's first cousin. He was the man in military uniform at 2018 TofC who supported QE II by sitting next to her during the trooping in the absence of the Duke of Edinburgh. The Duke of Kent also rode in the carriage with Harry & Meghan at TofC.
The Duke of Kent hands out the trophies at Wimbledon. His wife Katharine used to hand out the trophies for the women's championship.
As I mentioned earlier I've enjoyed reading about the British royals for quite awhile now since before Diana married Prince Charles. I've always admired Katharine Duchess of Kent, having seen pictures of her and watched her at Wimbledon over the years. I haven't had the occasion to see her speak, so it was nice to learn about her love of music and teaching. She's so modest, kind and understated about getting on with life and the tasks at hand. I knew that she'd given up Catholicism in order to marry Prince Edward. Fortunately, when the law was changed a few years ago, it enabled her to once again embrace the religion she'd grown up with and obviously missed. I believe one or two of her children also chose to worship in the Catholic faith.
A book published in 1979 first introduced me to the royal romances (to that date) of the House of Windsor, which included the love story and marriage between Prince Edward of Kent and Katharine Worsley.
Royal Romance: An Illustrated History of the Royal Love Affairs, by Lynn Picknett, 1979
ETA:
Oh, I see
@cygnus answered your questions. I thought everyone knew what Charles looked like as a little boy, a pre-teen and an adolescent young man.

He was rather cute, shy, sensitive and awkward, the anti-thesis of his sister Princess Anne, and not at all like his brash, confident and larger-than-life father Prince Philip. BTW, QEII's youngest son, Prince Edward of Wessex, was born in 1964 so he was not even a twinkle in his father's eye at this wedding. And Prince Andrew of York was around a year old, so he wasn't present. The Queen was only in the 9th year of her reign -- still very young.
There are lots of wonderful historical books on the House of Windsor (and on the 'grandmother of European royalty,' Queen Victoria). Some fascinating books:
Princes at War: The Bitter Battle Inside Britain's Royal Family in the Darkest Days of WWII, by Deborah Cadbury 2015
(provides a lot of detail about QEII's father and his brothers, the abdication crisis and behind-the-scenes emotional relationships between King George VI and his brothers that impacted some of the events of WWII) It's intriguing that both King George V and King George VI were second sons who ended up becoming king
Victoria's Daughters, by Jerrold M. Packard, 1999 (this book gives such fascinating insight on the lives and relationships between Queen Victoria, her daughters and their husbands -- offers pieces to the puzzle and the human stories behind many historical events of the late 19th and early 20th centuries, including the Russian Revolution and WWI)
The Reluctant King: The Life and Reign of King George VI, 1895-1952, by Sarah Bradford 1990
I mentioned handsome Prince William of Gloucester whom Prince Charles idolized -- the current Prince William was named after him. William of Gloucester's tragic love story and early death also provide pieces to the puzzle of the modern British royal family:
https://www.youtube.com/watch?v=OsUSWMvWPXw old Pathe clip as a baby with his parents Prince Henry, Duke of Gloucester and Princess Alice, Duchess of Gloucester
https://www.youtube.com/watch?v=DkGxb6sGLv8 old Pathe clip as a child in the lead-up to Princess Elizabeth's wedding; and glimpses of his younger brother, the current Prince Richard, Duke of Gloucester
https://www.youtube.com/watch?v=3SMX5kUDOas documentary:
The Other Prince William
The fun thing about looking back at some of the earlier royal weddings is seeing the unbroken tradition of royal followers flocking to the venue and sleeping on the sidewalks in the lead-up to the big day.
That's so good of Princess Eugenie for sharing her physical health challenges. Thanks for providing the link
@Garden Kitty. I'd never heard Eugenie had that problem. It reminds me of Prince Harry coming out last year to speak about his emotional struggles for which he'd sought mental health counseling. His revelations helped a lot of people. These are examples of the young generation of modern British royals in action, reaching out to change people's perceptions and to correct misperceptions, and in the process inspiring others. I'm hoping that Princess Eugenie's wedding might be televised in October. No announcement has been made yet regarding television access, but I believe there's more than enough interest. Royal weddings are a cause for celebration, even despite hers likely being a smaller and more intimate family celebration.