John and Elizabeth's marriage:
Digger - Pioneer Index. Victoria 1836-1888
Surname: HOSKIN
Given Names: John
Event: M
Spouse Surname/Father: ELLIS
Spouse Gvn Names/Mother: Elizabeth
Sex: M
Year: 1851
Reg Number: 29312
Denomination: Church of England
Parish: ST PETERS, MELBOURNE
Fiche: 425
Elizabeth's death :
Digger - Pioneer Index. Victoria 1836-1888
Surname: HOSKIN
Given Names: Elzth
Event: D
Spouse Surname/Father: Ellis Jas
Spouse Gvn Names/Mother: Elzth DONALD
Age: 54
Birth Place:
Death Place: BENALLA
Year: 1884
Reg Number: 11341
Digger - Pioneer Index. Victoria 1836-1888
Surname: HOSKIN
Given Names: John
Event: D
Spouse Surname/Father: William
Spouse Gvn Names/Mother: Mary ELLIS
Age: 51
Sex:
Birth Place: CORNWALL
Year: 1878
Reg Number: 444
That gives you a bit more info to search Cornwall with. There are plenty of possibilities for you to work through.
Regards
Alison