Clara Polak was a daughter of Levie Meijer Polak and Rosa van Minden. She married in Amsterdam on 17 March 1915 to Eliazar Sterk, son of Tobias Sterk and Sibilla Salomon Lek. Eliazar passed away already on 20 December 1929.
City archive of Amsterdam, archive card of Clara Polak and Genlias.