"Prince George of Cambridge (becomes King George VI upon his coronation) was born in 2013 and has overlapped Queen Elizabeth, Prince Charles, and Prince William by 2 years and 9 months."
We get your point jwleaks but remember that King George VI was born 14 December 1895 and died 6 February 1952; he was father to our current Queen, Elizabeth II. When young George does become King he may choose a different name, as will Charles. English royalty eh! Just don't ask Denis Skinner about it.
George (no regnal number)