what would happen if a bomb fell on Buckingham Palace in 1916, killing King George V, Queen Mary, The Prince of Wales, Prince Albert, Princess Mary, Prince Henry, and Prince George, leaving Prince John as King John II, who is the Regent for this 10 year old sickly king? will he be seen in Public or be hidden away as he was when just a Prince? how will the public deal with the Death of George V? and the death another king in 3 years?
Well that might have only happened on a holiday like Christmas cause most of the time David and Bertie would have been serving in the Army and Navy respectively the rest of the time.
but, for fun sake
King John II (I can't find but 1 King John in England and 1 King John of Scotland so....) would have most likely had his Aunt, Princess Royal Louise, Duchess of Fife as his Regent.
When he dies a few years later (assuming childless) she would succeed her nephew as sovereign, probably as Queen Victoria II (Louise Victoria Alexandra Dagmar).
Queen Victoria II
When she dies in 1931 her older daughter, Princess Alexandra, 2nd Duchess of Fife, will probably become Queen Victoria III (Alexandra Victoria Alberta Edwina Louise)
Queen Victoria III
When she dies in 1959, her son, Alastair Windsor, 2nd Duke of Connaught and Strathearn, will probably become King Arthur I (Alastair Arthur)
King Arthur I
Now here's where things get "interesting". Alistair Windsor died on "active duty" during WWII, in OTTAWA CANADA!
"He fell out of a window when drunk and perished of hypothermia overnight."
One of course would have to assume Alistair, Prince of Wales would NOT have been in a postion to fall out a window in Canada like Alistair, Duke of Connaught and Strathearn was in our timeline. One would have to assume he would have married, produced children, reigned and died later in this ATL. So today either his child or grandchild would be sovereign.
but for fun
Let's say Alistair, PoW still dies in 1943. Well the throne would pass to Queen Victoria III's nephew.
So here's your current King of England:
James George Alexander BannermanCarnegie, 3rd Duke of Fife
King James III (or George VI)