Rudolf lived in Berlin prior to emigrating to Holland in the 1930s. He married Hendrika Heidemann-de Wilde on 14.08.1941 in Amsterdam. Since they have the same date of death, it is likely they were deported together. (Bundesarchiv Gedenkbuch, Amsterdam City Archive Card)
I would appreciate any information on Rudolf's parents Hermann Heidemann and Rosalie Gertrud Heidemann-Lewisohn.