Thanks for the quick reply

I do have the marriage certificate and it shows John Mills parents names, although his mother's surname is unclear. I suspect he may have left Victoria as I have not been able to locate a death certificate in Vic. I shall have to broaden my search. I'm curious about the circumstances surrounding their separation - I've looked for divorce records but not yet found anything in their names.
I'm assuming that the seven children they had together were then brought up with Elizabeth's third husband John Homes, and that they remained in Avenel. Various descendents of the seven children have truned up still linked to Avenel. The original John Mills is however quite elusive!