At least one King of the United Kingdom's first grandchild was Charles, Prince of Wales.
Charles, Prince of Wales . Charles was born at Buckingham Palace as the first grandchild of King George VI and Queen Elizabeth . George VI ( Albert Frederick Arthur George ; 14 December 1895 -- 6 February 1952 ) was King of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 until his death .