Joseph Verveer and Hendrika Spiero were the parents of Rebecca (who passed away in 1926), Kaatje and Emanuel.
Haags Gemeentearchief, gezinskaart Joseph Verveer
In addition, a Jokos file (number 31674) 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 valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 12184/22230).