Sounds intriguing Vic, tell us more.
Prince John (1905-1919) was future kings Edward VIII and George VI's younger brother. Your Queen's uncle.
Because he had autism and/or epilepsy, he was locked away on a farm away from the family, shunned. Yes, shunned by his mother and father the Queen and King because they felt to acknowledge that John existed would be an admission of weakness or some kind of mental sickness running through the royal family.
So poor little Johnny was written out of history because he was an embarrassment to Saxe-Gotha's (soon to be Windsors). The few people who have written about Prince John portrayed him as a vegetable or a monster child because he was big. That was far from the truth.
You see him in earlier photos of the family when he is 4-5 years old...then, he disappears and is never mentioned again. AT the request of the royal family - he is shunned and considered a non human.
A trove of his letters to his friend (a girl) has cropped up recently, and they show a lad of average intelligence, but certainly not intellectually impaired in a significant manner...but the callous royal family were not taking any chances and he was cast adrift. He died suddenly when he was 14 years old and NOTHINg was mentioned to the British public.
There was a mixed reaction from the Royal Family to Prince John's death. His eldest brother, later Edward VIII and the Duke of Windsor, said brutally that "the animal" had died and bemoaned the fact that the family had to mourn him.
That is why the name "John" will never, ever be used to name a boy in your Royal family.
End of history lesson.