Allan,Can you track the family through the electoral rolls to find where they were living
Are there any children that you can ask about Oliver
There is a lot of posted info online about this family/tree and also a photo of him
one of the sons died in the war but you may already know that
LONGSTAFF, Private, OLIVER MICHAEL, VX68928. A.I.F. 2/4 Bn. Australian Infantry. 19th December 1944. Age 24. Son of Oliver Gladstone Longstaff and Margaret Longstaff, of Glenhunt1y, Victoria. PP. D. 13.
the best way is to find a family member if you can