I have been trying to trace the living descendants of my great uncle. Having now followed family death notices in the Sydney Morning Herald, I have now discovered sisters Sandra and Linda; the daughters of John and Valerie(?) Hall.
John was born c1937; and both girls were mentioned in their great-grandmother's death notice in 1967 - so it's a good guess they were both born between c1957 - 1967.
John was the son of Bernard & Kath Hall (nee McMahon), of Petersham, who married 1934.
Bernard was the son of William & Eda Hall of Petersham; who migrated from Manchester, UK to the Sydney area c1911.
Sandra & Linda will probably now be in their 50s, although if married I don't know their married surnames.
If anyone has any suggestions of how to contact them, or their father John Hall, I would be most grateful.