Thanks Geoff.
The Sydney Morning Herald - Wednesday 24 November 1943 p.12
DEATHS
STUART.-November 22, 1943, at her residence, 48 Carlisle Street, Ashfield, Louise, relict of John Stuart and loving mother of Albert, Nellie (Mrs. Ninness), Winnifred (Mrs. Salmon, deceased), Marie (Mrs. Greig), John (deceased) and sister of Lillian (Mrs. Watson) and grandmother of John, Joan, Jean and John. Privately interred 23rd inst.
I've checked TROVE again re John and can find nothing more.
I feel like moving on.
Dave