Joseph Fierlier was a son of Nathan Emanuel Fierlier and Roosje Swaab. He married 3 December 1913 in Amsterdam to Betje Vega, a daughter of Abraham Vega and Dientje van den Berg. The couple had three children: Roosje, Dientje and Nathan Joseph.
City Archive of Amsterdam, archive card of Joseph Fierl…
In addition, a Jokos file (number 8885) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.