Judith,
That's very interesting, because their names do change, or else the names on the Digger index are not their full names. For example, Caroline Eugenie at birth is Eugenia Bertuance at marriage, Thomas Daniel at birth is Thomas Sylvester at marriage, and later on as well.
Thomas Sylvester was a solicitor, company secretary, he looked after his brother-in-laws (George Doughty), fishing interests in British Columbia, Canada.
Certainly Hostein House rings a bell, it could have been the address that appeared on a newspaper report of the funeral of George Doughty in 1914. That report stated that Mrs. Stone nee Margaret Moran, wife of John had died before that date.
Thomas Sylvester Stone married Ennis Guendolyn Reed of Hawthorn, who was the daughter of Annie Walker and John Henry Reed in 1908, somewhere in Melbourne, I have a photo of both of them, both photocopied newspaper articles, which I will post.
Margaret Frances Stone married Ernest William Whitehead in 1914 in Grimsby, Lincs, Uk
I have posted the happy couple, George Doughty and Eugenia.