Esther Spaanbroek was a daughter of Gerrit Spaanbroek and Jaantje Cohen. She married on 24 August 1887 in Rotterdam to Joseph van der Sluis, a son of Ephraim van der Sluis and Clara van Velsen. Joseph however passed away on 4 April 1910 in Amsterdam.
The couple had eleven children together, of whom Simon and Elisabeth have survived the Holocaust, unfortunately not the other children Klara, Gerrit,…