Rachel Crost was a daughter of Ephraim Crost and Bloeme Trompetter. She married in Amsterdam 27 August 1908 Cosman Monnikendam, a son of Abraham Salomon Monnikendam and Schoontje Wijnberg. The couple had a daughter Jenny, who was married to Salomon Manassen.
City Archive of Amsterdam, family registration card of Ephraim Crost and website www.wiewaswie.nl