Catharina Groen was a daughter of Eliazer Groen and Rosina de Haan. In the Groen family eight children have been born, of whom only the eldest son has survived the Holocaust. Catharina married (presumably about 1940 in Den Haag) to Karel Louis Leons, a son of Salomon Leons and Dina Selina Wolf. He was previously married to Elise Philips van Buren but divorced from her in March 1939. Catharina Groe…