John Charles Frost was born in 1895, in Hatfield, Herts, son of James Frost (a Groom) (B 1867 in London Colney, Herts) and Ellen Alice Frost (ne Keable) (B 1866 in Harleston, Norfolk). Baptised on 24th March 1895, in Hatfield. His father James died in 1899, aged 32 years.
1901 Census records John aged 6, living with his widowed mother, brothers James 15, and George 9 and sister Annie 12, in Hall's Yard, Park Street, Hatfield.
His mother Ellen married Frank Thomas in 1904, in Hatfield. John left school in January 1909, aged 14, to start work.
By 1911 John was working as a Greengrocers Lad, living with his mother, stepfather Frank Thomas and brother James 25, in Chapel Yard, Park Street, Hatfield.