Rosette Eisendrath was a daughter of the bookseller Samson Eisendrath and Henriette Wolf. She was born on 24 December 1882 at Oude Zijds Achterburgwal 153 in Amsterdam. At the age of 29, she married the 40-year-old Siegfried Nathan Beer, a son of Nathan Hermanus Beer and Clarisse Beer, on 27 June 1912 in Zaandam. Siegfried was born on 27 February 1872 in Amsterdam and was an office clerk by profes…