William Millar Bird was the elder son of William and Jane Hannah Bird (nee Miller) of 33 Capel Road, Oxhey.
His parents married 1888 in the Berkhamsted, Herts, district. Jane died 1914 in Oxhey, Herts, aged 57, and was buried 24 June at St James’, Bushey, Herts; William possibly died 1942 in the Hitchin, Herts, district aged 80.
William was born 23 September 1889 in Watford. On the 1891 Census, aged 1 he lived in Bushey, Herts, with his parents and no siblings. On the 1901 Census, aged 11 he still lived in Bushey, with his parents and one sibling.
William attended Watford Grammar School from April 1903 to December 1905. He resided in Watford.
His father was a grocer and he had a younger brother, Ernest, born in about 1903. His mother helped run the grocery business. Both William and Ernest grew up in Oxhey.
By 1911 the family had moved to 44 Villiers Road, Oxhey. William by this time was 21 and a bank clerk and Ernest, aged 17, was employed as an insurance clerk.