Hello
Lets start with some ages for the couple
August Grossman age 53 in 1873 and Wilhelmina 57
With them are Carl 23,Henrietta 25 and Bertha 17
He was buried Bundaberg General Cemetery 24 May 1892 age 74years .He wife is in the same grave Wilhelmina Caroline Grossman died 15 Sept 1907 age 84years.
Her father is given as Carl Kunkel .Mother Maithae.
He gives his parents as Daniel and Dorothea Sophie Fenrich (the death index suggest he was Wilhelm August Grossman
www.findagrave.com/memorial/124060300/august-grossmannTheir daughter Henrietta is also there 1847-8.8.1920
There seems to be a third daughter Amelia Augusta Albertina born 1845 dies 21.4.1925 Also buried at the Cemetery
www.findagrave.com/memorial/102750662/amelia-augusta_albertina-barkeShe married a Carl Frederich August Barke 1847-June 1928.They were also on the Reichstag over to Australia.
1919 Electoral Rolls Budeburg Bay Electra St lab .
Children Helena Isabella,Theodore Emile,Arthur Hermann,Carl ,Emelia
Carl Julias Grossmann died 3.8.1937
/www.findagrave.com/memorial/124060310/carl-julius-groszmann
Looks like he was a tailor -1925 electoral register Crofton St Caprocorna Bundaberg
Bertha married 28.8.1876 a Micheal Duffy1848-4.2.1926 and moved to Sydney .She is buried Macquarie Park Cemetery and Crematorium 5.4.1929
www.findagrave.com/memorial/145821304/bertha-duffy9.11.1911 the couple and their family had gone to New York on the Luisitania but must have returned to Australia .He says he has independent means.
Not sure exactly what you are after.
Ciderdrinker