Emanuel Zwartverwer was a son of Samuel Zwartverwer and Rebecca Fresco. He married in Amsterdam on 16 April 1913 to Reichl Strus from Czestochowa. The couple had five children: Catharina, Samuel, Abram Sija and the here mentioned Raphael and Louis.
City Archive of Amsterdam, archive card of Emanuel …
In addition, a Jokos file (number 50038) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.