Calman Blok had been previously married to Duifje Gomperts, who passed away in 1900. Their daughter Regina Blok, who lived on a different address, died during the war. Addition of a visitor of the website.
In addition, a Jokos file (number 1891) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.