Edward, Prince of Great Britain, Duke of Kent and Strathearn; by Sir William Beechey, c. 1818. He was the son of King George III of Great Britain. He was also the father to Queen Victoria of Great Britain.
Caroline of Ansbach was the wife of George II, and therefore Queen of Great Britain when he became king. She was the mother of Prince Frederick of Wales, who never became king but whose son rules as George III. George III was the grandson of George II.
George IV, Prince of Wales, later the Prince Regent and then King of The United Kingdom of Great Britain and Hanover; by Richard Cosway, c. 1780-1782. He was the eldest son of King George III of Great Britain.