William was born on the 20th September 1891, in Chelsea, London. The son of William James Everett and Martha Everett (nee Wallis). His father was the coachman to the Smith family of Goldings Park, Hertford. He was Baptised on the 8th November 1891, in Holy Trinity Church, Chelsea, London.
The 1901 census records William aged 9, living with his parents, brother Henry 7, and sister Ida 4, at The Coach House, 142 Pavilion Road, Chelsea, London. In 1911 William 19, is a Student, living with his parents, brother Henry 17, and sister Ida 14, at Goldings Park, Hertford.
William was highly educated. He was the Assistant Head at Duke’s School, Alnwick, Northumberland. He married Alice Isabella Orde Fairgrieve in September 1917. They had one son William J Everett.