Jacques Querido was married to Roosje Wertheim. The couple lived at the Geldersekade 43-I in Amsterdam. Jacques Querido was a diamond worker. In the evenings, he performed as a magician and musician.
Amsterdam municipal archive, Records Jokos, Möbel-claim 50312; property Joods Maatschappelijk Werk
In addition, a Jokos file (number 50312) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.