So glad to have been able to help you and Bill out. Perhaps now Bill will be able to find his birth certificate.
It seems that William Robert WEHSACK may have changed or used different surname - WILSON see death notices below for WILLIAM ROBERT and also his father WILLIAM
Found his father's death
WILSON-WEHSACK. — On the 1st June, of Melbourne, Willam, relict of Clara, and beloved father of William Robert, aged 74 years. —At rest. (Privately interred on the 3rd June.)
WILLIAM ROBERT's Death notices
The Argus (Melbourne, Vic. : 1848 - 1956)(about) Previous issue Tuesday 2 March 1954 Next issue
WEHSACK, William Robert.—On March 1, at his home, dearly loved son-in-law of Charlotte McAlpine. -Peacefully sleeping.
WEHSACK, William Robert.—On March 1, at his home, 47 Sutherland road. Armadale, beloved brother-in-law of George and Rosemary, uncle of Bruce. Ian. David, and Grace. -In God's care.
WEHSACK, William Robert.—On March 1 (suddenly), at his home, 47 Sutherland road, Armadale, beloved
brother-in-law of Lance and Rae, -Ever remembered, our pal.
WILSON (Wehsack), William Robert. - On March 1 (suddenly), at his residence, 47 Sutherland road. Armadale, dearly loved husband of Elsie, aged 49 years. -At
WILSON (Wehsack).—The Funeral of the late Mr. WILLIAM ROBERT WILSON will leave his residence, 47 Sutherland road, Armadale, TOMORROW (Wednes- day), after a service commencing atFix this text 1.45 p.m., for the St. Kilda Cemetery.
Cemetery ST KILDA GENERAL CEMETERY
Given Names WILLIAM
Date of Service 3/03/1954
Burial Type BURIED
Location Details CHURCH OF ENGLAND, MONUMENTAL, COMPARTMENT D GRAVE 189
Public Grave N
Tenure Date IN PERPETUITY - FOR ALL TIME
Iris Valinda MILTON was in the District of DAWSON subdistrict: Eidsvold in 1968 I would suggest you try this area for her burial. Qld deaths online only go to 1964.
I will try and see what else I can find.