looking for information on Josef Emil Maximilian Rossmann(b. 29 Mar 1831 Danzig, d. 19 Dec 1877 Sonnenberg} and his wife Emma Adelheid Alexandrine (Kuehl) (b. 18 Feb 1843 Danzig, d. 6 Jan 1916 Harburg).
Also their son Mark Erich Rossmann (b. 5 Sep 1867 Danzig, d. 5 Jun 1933 Frankenau}. He married Marie Auguste Karoline (Gabritsch) (b. 26 Apr 1868 Wienerneustadt, d. 20 Aug 1956 Frankenau}.
Mark and Marie had at least two children, a Frederik or Fritz Rossmann, and Marie Gertrud Hanna (b. 22 Dec 1906 Harburg, d. 26 May 1954 Marburg}. Marie Gertrud Hanna married Wilhelm Heinrich Brandes on Oct 28, 1928. They have six children. They are my grandparents.