Rosa and Joachim A. lived at Invalidenstr. 18 in Berlin-Mitte before emigrating to Holland. Rosa's husband, the father of Joachim, was Max Arenstein. He was born on 13.02.1873 in Berlin and was a medical doctor. Whether he died prior to or after the family emigrated to Holland is unclear. (Berliner Gedenkbuch, Jewish Addressbook Berlin 1931, Amsterdam City Archive Cards)
Addition