He was educated at Westminster and Christ Church , Oxford , and went on a Grand Tour between 1764 and 1766 .
He was the only brother of Prime Minister William Cavendish - Bentinck , 3rd Duke of Portland .
brother was educated at Westminster and Christ Church , Oxford , and went on a Grand Tour between 1764 and 1766 .
He was the only brother of Prime Minister William Cavendish - Bentinck , 3rd Duke of Portland .