OK...Debrao would you
please list the siblings born prior to Ernestina...and I am certainly aware of what information is available on Victorian birth, death and marriage certs
It is always helpful to other forum members if you happen to have a cert, to list ALL the information. It is often the smallest snippet of info that breaks down brick walls

What are the parents ages on the birth cert?
Apologies for not following up the info on Elizabeth before posting....I usually do that but am having problems with my Vic discs at the moment. However there is no birth registration for Elizabeth with parents George and Elizabeth MEYER. There are registrations missing from the Vic bdm's and perhaps this is one of them. I notice on Elizabeth's marriage reg that she was born Dandenong [Robert was born Sydney] and that was also the place of birth for sibling George in 1872.
Perhaps wait for the marriage cert to arrive

This
may be your George....his father was Isaac and George was born South Australia.
CHURCH George
Criminal records 1850-1900 Victoria
Born 1852 Adelaide
Source: Victorian prisoners index c.1850-1900 (males) VPRS 515/10 Page#07221
Comment: Mother at Bendigo, Father Isaac. Prisoner No 7128
Cheers
Cando