Sander Waas, a son of Barend Waas and Sopia Kroonenberg, was married in Amsterdam on 4 March 1903 to Eva Slap. a daughter of Izaak Slap and Rachel Waas. The couple had eight children of whom one son died as a baby, one son probably died in 1933, 20 years of age, two daughters have survived the war (of whom Margaretha was married to 520315))), but four children, Sophia, Izaak, Mozes and Jansje h…