Henry (Harry) was born in Calgary, Alberta, Canada in 1891, the son of Harold Dawson Critchley and Amy Corinne (nee Fordham) Critchley, grandson of Edward King Fordham of Redlands Grange, Ashwell.
Charles was the eldest son of Charles and Agnes Ellen Maud (nee Howard) Day, born on 17 January 1897 at Ashwell, Hertfordshire. He was a pupil at the Merchant Taylors School in Ashwell.
Edward was born in Ashwell, Hertfordshire on 16 December 1896, the ninth son of Leopold and Mary Ann Elizabeth (nee Bonfield) Day. He was a pupil at the Merchant Taylors School in Ashwell.