Klara Nathans was a daughter of Simon Nathans, merchant and cafe owner at Haren (province of Groningen), and Betje de Jong. She married 23 August 1905 in Haren Salomo Polak, an office clerk from Hoogeveen and a son of Simon Polak and Bettje van Rhijn. The couple had four children, namely Bettje (Betty), Simon and the twinsisters Betsy Aaltje (Bep) and Carolina Bertha(Lineke). Klara's son Simon was…