Falle was born on Jersey in the Channel Islands, the son of Joshua George Falle (1820–1903), Constable of Saint Helier and later Jurat of the Royal Court of Jersey, and Mary Elizabeth (née Godfray; died 1917).
During the First World War he served in the Royal Field Artillery, gaining the rank of Major.
[7] Falle married Mary, daughter of Russell Sturgis and widow of Lt.-Col. Leopold Richard Seymour, in 1906.
In accordance with his wishes, his sister Albina (who died in 1957) made a bequest to the States of Jersey which became the "Lord Portsea Gift Fund".
The fund assists people from the Channel Islands who are unable to obtain sufficient financial support for additional training, re-training or specialised equipment to benefit their careers in the employment of the States of Jersey or of Guernsey, or of the United Kingdom.