He was a nephew of Prince Philip, Duke of Edinburgh, a nephew-in-law of Queen Elizabeth II, and thus a first cousin of King Charles III.
[1] The family was not invited to Philip's wedding to Princess Elizabeth of the United Kingdom in 1947, due to his parents' membership of the Nazi Party.
[2] Six years later, however and his parents and sister, Princess Beatrix, were seated in the royal box at his aunt's coronation in Westminster Abbey.
In 1965, he received his aunt and uncle, Queen Elizabeth II and Prince Philip, Duke of Edinburgh, at the damaged castle during their state visit to West Germany.
His wife at the time, Charlotte, an art historian who represented Germany at Christie's, assisted in the restoration.