Hi,
His marriage notice found at Trove says,
The Age (Melbourne, Vic. : 1854 - 1954)
Friday 29 June 1917
"CUNLIFFE-OWEN -- LONGDEN. On the 31st May at Renton by Rev. Walter G. ROWE, Granville CUNLIFFE-OWEN eldest son of Mr and Mrs George Alexander CUNLIFFE-OWEN, Chili, South America to Ada Catherine third daughter of Mr and Mrs Walter LONGDEN, Geelong and granddaughter of Mrs LONGDEN and the late Captain LONGDEN, Geelong."
Regards,
Daisy