Benjamin Polak was a son of Meijer Polak and Clara Canes. He married 25 July 1907 in Amsterdam to Roosje Pampel, a daughter of Mozes Pampel and Saartje Digtmaker. They had two daughters: Clara and Sara.
Stadsarchief Amsterdam, archiefkaart Benjamin Polak and website www.wiewaswie.nl .