Rosa Ketellapper, a daughter of Abraham Ketellapper and Vrouwtje Kloot, married 23 May 1934 in Amsterdam to Meijer van der Horst, a son of Karel van der Horst and Reintje Turksma.
Rosa had still another brother Marcus and a sister Jeannette.
City Archive of Amsterdam, archive card of Abraham Ketellapper and website www.wiewaswie.nl.