Isaac Betel was a son of Simon Betel and Elisabeth Polak. He married 19 April 1906 in Amsterdam to Betje Piller, a daughter of Leendert Piller and Anna Mossel. Besides the at home living son Nathan, there were two other sons who lived elsewhere: Leonard and Simon. City Archive of Amsterdam, archive…
In addition, a Jokos file (number 50425) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.