The Sydney Morning Herald Thursday 24 January 1929 has the funeral notice for William Thomas the infant son of Mr and Mrs William CAHILL jun. Funeral was at Woronora.
Death notice for Jessie with husband William still alive. The Sydney Morning Herald Friday 30 September 1938 CAHILL. —September 28, 1938, at St. George District Hospital, Kogarah, Jessie (Nurse), beloved wife of William Cahill, and loving mother of Irene and William, aged 66 years.
This is the death of 92yo William Thomas CAHILL. 21841/1957CAHILLWILLIAM THOMAS;92 YEARSROCKDALE;(f)WILLIAM
Could be the same William who married Catherine WHELAN as there was no other William CAHILL in SA around that time. No children recorded in SA for this couple. South Australian Marriages, Registrations 1842-1916 Groom: William CAHILL aged 22 son of John CAHILL Bride: Catherine WHELAN aged 22 daughter of Michael WHELAN Date: 23 Nov 1861 Place: St Aloysius Sevenhill District: Cla/Book/Page: 48/276