You won't get much information off George's death certificate #17661/1944 as he most likely passed away an inmate of Aradale Mental Asylum, where very elderly folks with 'senile decay' were sent for care.
https://www.aradale.com.au/I checked on prov.vic.gov.au and there's no inquest record for George
https://prov.vic.gov.au/Your best source of information regarding George's parents will be the marriage certificate which isn't all that helpful.
13 April 1874 at "The Manse" Avoca, in the rites of the Presbyterian Church
George Baker, 26, of Amphitheatre , labourer
Father: John BAKER; mother unknown.
Born: Adelaide, South Australia
to
Mary Iles, 16, of Amphiteatre
Father John ILES; mother Ellen WHITE (who was one of the witnesses)
MARRIAGE CERTIFICATE IS ATTACHED