Gustav Wilhelm Mischke is on Geni as
According to QLD Births Deaths and Marriages
So 2 Gustav's have been confused.
Which one married Gladys?
https://www.findagrave.com/memorial/215915916/gladys-freda-mischkeGustav Wilhelm MISCHKE born 10/10/1912 died 25/5/1982and Gladys Freda born 10/12/1919 died 29/8/2017 share a gravesite at Ropeley Lutheran Cemetery