Ina's suggestion is the only way to go.
Here is what I have found on Gwynne LEE.
1943 Eden Monaro, Queanbeyan electoral roll:
LEE Gwynne Averil Mary, 2 Hobbs St., telephoniste
LEE Rufus Augustus Richmond, 16 Morrissett St., grocery manager.
Not sure if there is any connection to Rufus LEE, but here is some info on him:
Marriage in 1925 of Rufus LEE
18028/1925 LEE RUFUS A R WENBAN ILMA M BURWOOD
Death of Ilma LEE (nee WENBAN) in 1976:
25021/1976 LEE ILMA MARY ALPHEUS ELIZABETH JANE
Now back to Gwynne. The two marriages of her husband. First in 1944, the second in 1957.
23008/1944 DUNMALL STANLEY LESLIE VICTOR LEE GWYNNE AVERIL MARY HURSTVILLE
23582/1957 DUNMALL STANLEY LESLIE V DARBY ISABEL EMILY BURWOOD
The divorce of Stanley and Gwynne DUNMALL was printed in the Sydney Morning Herald on 23 April, 1957.
The death of Stanley DUNMALL in 1964
15410/1964 DUNMALL STANLEY LESLIE V ARCHIBALD SYDNEY UNKNOWN MORUYA
DUNMALL Stanley, April 5, 1964 (Sergeant of Police) (suddenly), at Bateman's Bay, dearly loved husband of Isabel, loved father of Elizabeth, Stephen, Gregory and Robert, aged 42 years.
.... beloved son of Sarah, dear brother of Adeline and Dorothy, brother-in-law of Reg and Fred. Aged 42 years.
DUNMALL The relatives and friends of the late Stanley DUNMALL (Sergeant of Police at Cooma) are invited to attend his funeral to leave the Church of England Chapel, at Rookwood Cemetery, this Wednesday, afer service commencing at 3 pm, for interment in the adjoining cemetery.
Death of Gwynne DUNMALL in 1991.
DUNMALL Gwynne, September 21, 1991, late of Berkeley Vale, beloved mother of Pam and Lee, and special friend, Brandy. Always in our hearts.
DUNMALL The funeral service for the late Gwynne DUNMALL, of Berkeley Vale, will be held in the chapel at Palmdale Memorial Park, Palmdale Road, Ourimbah, today (Thursday), commencing at 2pm. Interment in the adjoining cemetery.
CB32062 DUNMALL Gwynne 26 Sep 1991 Palmdale Serenity N Lot 183 010
CP12149 Ms Dunmall Pamela 25 Nov 2006 Palmdale Repose 2 J Lot 124 010