Elisabeth Ketellapper was a daughter of Salomon Ketellapper and Judith Sweijd, a family with six more children: Susanna, Vrouwtje, Debora, Marie, Levie and Nathan. She married to Hartog Lap in Amsterdam Watergraafsmeer on 30 August 1922.
City Archive of Amsterdam, family registration-card of Salom…
In addition, a Jokos file (number 21283) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.