Martin was married on 26.11.1918 to Anna Sofie Sternfeld-Retzke, born in 1892 in Berlin. She was almost certainly non-Jewish, and she survived the war and was living in 1954 in Berlin-Zehlendorf. (Amsterdam City Archive Card)
There is a tragic irony in the fact that most Jewish families with a "mixed marriage", ie a non-Jewish family member, were largely protected from deportation when they live…