William was born at Thriplow, Cambridgeshire on 11th March 1896, the eldest son of Alfred and Alice Mary (nee Surrey) Moule.
Percy was the younger son of George Edward William and Elizabeth (nee Jeeves) Pettengell, born at Ashwell, Hertfordshire on 2 October 1895. He was a pupil at the Merchant Taylor School in Ashwell.
John was born at Hinxton, Cambridgeshire on 27 January 1895, the only son of Frederick and Mary Ann (nee Whitehead). When John was about eight the family moved to Bygrave, Hertfordshire and it is likely that he was a pupil at the Merchant Taylors School in Ashwell, Hertfordshire.