Isaäc Drukker and Sara Duque married in 1901 in Haarlem. They had four daughters: Lea, Elisabeth, Judith and Rosa. Isaäc and Sara were father and mother in the Portugees-Israëlitisch Jongensweehsuis (Jewish Portuguese orphanage) on the same address.
Stadsarchief Amsterdam, archiefkaart Isaäc Drukker
In addition, a Jokos file (number 55884) on this household 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 valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 2777/14479).