Isaac Ketellapper was a son of Marcus Ketellapper and Rachel Bonewit. He married 4 May 1905 in Amsterdam to Leentje Frinkel, a daughter of Simon Frinkel and Jeltje Goldsmit. The couple had four children: the still at home living and unmarried Rachel, their two sons, Marcus and Simon, who lived with…
In addition, a Jokos file (number 50621) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.