His father , Henry Dixon Arnott , was a barrister and President of the Royal Aero Club of New South Wales .
Arnott was the great - grandson of William Arnott , who founded Arnott 's Biscuits .
Arnott 's father , Henry Dixon Arnott , was a barrister and President of the Royal Aero Club of New South Wales .
Arnott was the great - grandson of William Arnott , who founded Arnott 's Biscuits .