Susanna Ketellapper was a daughter of Salomon Ketellapper and Judith Sweijd, a family with six more children: Elisabeth, Vrouwtje, Debora, Marie, Levie and Nathan. She married in Amsterdam on 15 December 1915 to Markus de Hond.
City Archive of Amsterdam, family registration-card of Salomon Ketella…
In addition, a Jokos file (number 20669) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.