Hmmm - this may be a bridge too far - or a leap too far - certainly a long shot, but seems to me a possibility. I'd be delighted if someone can rule this idea out.
Searching on TROVE for the name MIDLANE I came across the death of a
Russell MIDLANE, aged 90, in December 1928 (Russell Midlane COOMBE b 1840, so reasonably close); husband of Margaret, father of Florence (Mrs. Sparkes), Bertha (Sister Mary Elizabeth), Ruby (Mrs. Sibley), and Ella.
https://trove.nla.gov.au/newspaper/article/16518045Death registered Sydney 17062/1928 Russell MIDLANE. No parents shown on index.
On looking further I see the marriage of this couple:
3106/
1917 Russell MIDLANE, Margaret MOORE, registered at West Wyalong.
I have found possible births of some of the daughters which are a good while before the marriage so it's possible that either or both Russell and Margaret may not have been free to marry earlier, especially given that the family seems to be Roman Catholic. I cannot see any of the daughters' births registered under the name MIDLANE.
Possible birth: MOORE Ruby Lillian 9340/1898 MargaretSydney
Marriages:
6553/1908 James M SPARKES, Florance M MIDLANE, registered WYALONG
7913/1919 Ernest SIBLEY, Bena R MIDLANE, registered REDFERN (comment: Bena, near Wyalong is the name of the place where Russell and Margaret lived)
Deaths - all these have Russell and Margaret listed parents
Florence May SPARKES,4603/1972
Bertha Cathleen MIDLANE, 27807/1950, registered BATHURST
Obit for Bertha as Mother M Elizabeth MIDLANE, aged 64 says she was born at Wilcannia, (thus a birthdate of about 1886)
https://trove.nla.gov.au/newspaper/article/161407419Ella MIDLANE, 11811/1963, reg BATHURST
Bena Ruberta SIBLEY, 21329/1970 reg NEWTOWN
So the death registrations for the daughters recognise Russell and Margaret as their parents and the marriages for Ruby/Bena and for Florence
https://trove.nla.gov.au/newspaper/article/213351322 use the surname MIDLANE.
Now, I may well have missed others, but the earliest references I can see for any Russell MIDLANE are:
Government Gazette mentions
1890 Russell MIDLANE, Cobar
1892 at Condobolin
1896 at Livingstone, Condobolin
1898 contract awarded for mail delivery for Bena and Wamboyne, residence Bena
There are some TROVE mentions of the MIDLANE family at Bena - mostly social snippets.
Could this Russell MIDLANE be Herbert Russell Midlane COMBE? I'm not seeing mention of Herbert COMBE after the birth of his children although death reg indexes for Charles and Thomas list the father as Herbert R M
Charles COMBE 1865 - 1932, Thomas 1866 1942, Frances in 1868.
can anyone help with this?
Sorry it's a bit long-winded but thought I should present all the "evidence"
Judith