Dunning was born on 17 January 1878 in
Mahurangi, north of
Auckland. His mother was Margaret Mackay Dunning and his father was Rufus Dunning. His sister Frankie Regina Dunning was born in 1880, a brother Arthur Rufus was born and died in 1881. A sister, Una Nicholas Irene also died within a year of birth in 1882, while another sister was born in 1883 but died in 1886 at the age of 3. Another sister Eleanor was born in 1883, and sister Eva was born in 1884. Uriel was born in 1884 but died two years later in 1886. Dunning was a builder by trade. ==Rugby football==