What relation is Queen Elizabeth II to King George III ?
George III was her 3rd great grandfather. If you you follow the line of succession on her grandfather’s side – George VI (father), George V (grandfather), Edward VII (great grandfather), Victoria (2nd great grandmother) , Edward Duke of Kent (3rd great grandfather), George III (4th great grandfather) – then he was her 4th great grandfather. However her grandmother Queen Mary of Teck was also descended from George III – she and George V were 2nd cousins once removed. If you follow Queen Elizabeth’s line through her grandmother – George VI (father), Queen Mary (grandmother), Mary Adelaide (great grandmother), Adolphus of Hanover (2nd great grandfather), George III (3rd great-grandfather) – he is more closely related as her 3rd great grandfather. You can see this on the Royal Family tree.