Joseph van Os was a son of Nathan van Os and Keetje Weesel. He was married in Amsterdam on 12 December 1906 to the widow of Isaac de Vries, Vogeline de Rosa. The couple had six children together: Nathan, Wilhelmina - she survived the Holocauste - Neftalie, and the sons who lived at the same address …
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Nathan, 5 juli 1907
Wilhelmina, 28 december 1908
Neftalie, 6 september 1911
Hartog, 13 november 1913
Andries, 4 april 1917
Salomon, 30 juli 1922
Bron SAA Archiefkaart Joseph van Os 26-2-1887
In addition, a Jokos file (number 60875) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.