A Shirley Eliane Atkinson married a Michael Patrick Deary in 1945 in Balmain. She died 2 Nov 1970 (late of Milperra), aged 43 (so born about 1927). There is a death notice in the Sydney Morning Herald on 3 Nov 1970 if you can obtain it. It may give you more family members.
NSWBDM gives the parents (at her death) as Thomas and Mary Ann and death (registration) as at Burwood.