Harry was the second son of Arthur and Eva Eliza Ann (nee Smith) Covington born in January 1890 at Ashwell, Hertfordshire. He was a pupil of the Merchant Taylors School in Ashwell.
Harry was the eldest son of Julius James Eversden and Emma (nee Harradine) Eversden, born at Islington, Middlesex on 7 November 1879. He was christened in Ashwell and he was a pupil at the Merchant Taylors School in Ashwell.
David was born at King Williamstown, Cape Colony, South Africa on 2 November 1877 to David and Martha Gamble.