Seems to be some variation on Victor's father's names

Australia births
Name: Victor Hamilton McDonald
Birth Date: 25 Jun 1887
Father's name: George Roderick McDonald
Mother's name: Mary Shaw
Birth Place: Queensland
Registration Year: 1887
Registration Place: Queensland
Page Number: 9638
Registration Number: 006922

Marriage
Name: Victor Hamilton McDonald
Spouse Name: Constance Charlotte Weinheimer
Marriage Date: 01 Nov 1911
Marriage Place: Queensland
Registration Place: Queensland
Registration Year: 1911
Registration Number: B010812
Page Number: 16912


Death
Name: Wictor* Hamilton MacDonald
Death Date: 15 Mar 1953
Death Place: Queensland
Father's name: Roderick Alexander McDonald
Mother's name: Mary Shaw
Registration Year: 1953
Registration Place: Queensland
Registration Number: B042492
Page Number: 1439

WW1
Name: Victor Hamilton McDonald
Birth Place: Maryborough, Queensland
Dossier Year Range: 1914-1920
Enlistment Place: Brisbane, Queensland
Service number: 5389
Next of Kin: Constance Charlotte McDonald
Relationship to Soldier: Wife
Unit 15th rifles 31st bat.
Enlisted 31 Jan 1918

According to enlistment Victor and Constance had 3 children.
they were living in Hipwood Street, Spring Hills, Brisbane

Victor's occ listed as seaman. he lists his birth as 25 June 1886 ?? (31yrs 7 mons)

It would be worth getting copies of his service records it give a fair bit of info.