"[5] Morris's twin brother John "Johnny" became a photographer and married Thelma Mansfield.
Their elder brother, George Redmond "Red", followed in the footsteps of their father, Lord Killanin, by becoming a film producer.
In 1974 he rode Mr Midland to victory at Cheltenham giving Edward O'Grady his first Festival winner.
He rode Billycan to victory in the 1977 Irish Grand National, a race he was subsequently to win twice as a trainer.
[14] Morris's first major breakthrough came when Buck House won the 1983 Supreme Novice Hurdle, giving him his first winner at Cheltenham.
[13] The 1990s started brightly for the Mouse Morris yard when Trapper John ridden by jockey Charlie Swan won the Stayers' Hurdle at the 1990 Cheltenham Festival.
The following year Cahervillahow was beaten by a short head in the Irish Grand National[16] and merely three weeks later in the Whitbread Gold Cup he was controversially judged to have interfered with runner-up Docklands Express in the closing stages.
In 2011, he trained the winner of the Grade 1 Neptune Investment Management Novices' Hurdle at Cheltenham, First Lieutenant, ridden by Davy Russell.