You need to see the death certificate, Edward Maurice HARVEY, 1944.
Contact the cemetery and ask who else is buried in plot 0521.
Edward Maurice HARVEY married, 1920, and died 1944.......and your source of information is a grand daughter.....who never met him?
You need much more information from your friend about her grandfather, and accept that it is second hand information....not from her personal recall.
http://www.easternsuburbsmemorialpark.com.au/burialsName: Edward Maurice HARVEY
Date of death: N/A
Date of service: 29/05/1944
Type: Buried
Location: CA - Congregational FM A, CA - Congregational FM A, Position 0521
Name: Donald Bruce HARVEY
Date of death: N/A
Date of Service: 23/03/1937
Type: Buried
Location: CA - Congregational FM A, CA - Congregational FM A, Position 0522
Name: Edward Maurice HARVEY
Date of Death: N/A
Date of Service: 18/04/2001
Type: Cremated
Location: CA - Congregational FM A, CA - Congregational FM A, Position 0522
Name: Kathleen Mary Harvey
Date of death: N/A
Date of service: 15/04/1977
Type: Buried
Location: CA - Congregational FM A, CA - Congregational FM A, Position 0522
Donald Bruce HARVEY sounds rather Scottish.