Although he had no children with his first wife, with his second he had two sons and one daughter. Kempe was President of the London Mathematical Society from 1872 to 1874.
Kahit na siya ay walang bata sa kanyang unang asawa, sa kanyang ikalawang niya ang dalawang anak at isang anak na babae. Kempe ay Presidente ng London matematiko Society 1872-1874.