Marks Dekker and Catharina Kapper were married at Westerbork transit camp on 10 May 1943. He was the widower of Rebecca Sousa. He was a son of Jacob Dekker and Kate Houlsom, both deceased. Catharina was the widow of Hartog Lopes Cardozo. She was a daughter of Samuel Kapper and of Rachel Visjager, both deceased.
Record of marriage certificates of the Westerbork municipality, currently at the archives of Gemeente Midden-Drenthe in Beilen
According to the death records of camp Sachsenhausen Marks Dekker died on 20 December 1944. It is possible this date is different from the official day of death as established after the war by the Department of Justice.