Rachel Jacobs was a daughter of Lion Jacobs and Mietje Ossendrijver. She married 27 June 1917 in Amsterdam to Mozes van Sijs, a son of Aaron van Sijs and Sientje Swaab.
Cith Archive of Amtsterdam, archive card of Lion Jacobs and website www.wiewaswie.nl .
In addition, a Jokos file (number 55141) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.