It seems in the light of the above, to reasonably speculate, Thomas and Michael WALSH were brothers
Each seems to have a son named Richard John and we know Richard is the name of the father of the Thomas WALSH who died near Narrabri.
No street numbers listed on the electoral roll.
South Australian Electoral Roll
1909
MARTIN George Gozzard Young Street, Parkside Civil servant
MARTIN Henrietta Augusta Young Street, Parkside Home duties
WALSH Isabella Sarah Young Street Parkside Domestic
WALSH Mary Agnes Young Street Parkside Widow
WALSH Richmond John Young Street Parkside Bootmaker
WALSH Ruby Ages Young Street Parkside Home duties
Cando
1909 Sept 8th
V* MICHAEL WALSH (Boot Manufactuier) are respectfully informed that his Funeral will leave Ins late residence, Glen Osmond-road, Parkside, on WEDNESDAY, at 3.30 p.m., for the Catholic Cemetery, West-terrace.
There are numerous references in the South Australian papers to the Bootmaker Michael WALSH and his wife advertised it t for sale after his death.
Here is an Obituary. More than one address is given
http://trove.nla.gov.au/ndp/del/article/167016377I am no good at SA research at all, but can we see the parents of Michael WALSH who died in 1909?
It may be the case that Johanna was visiting her sister in law Mary Agnes WALSH.
Sue