Betsy Maandag was a daughter of Salomon Maandag and Judith de Hartogh. She married 17 June 1915 in Amsterdam to Izaak Gossachal, son of Jacob Gossachalk and Eva Clarenburg. The couple had a daughter who has survived the Holocaust.
City Archive of Amsterdam, archive card of Judith de Hartogh and Izaa…
In addition, a Jokos file (number 502) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for looted securities or bonds. (W-claim, number 02/719).