Betje Hakker, daughter of Salomon Hakker and Rachel van der Kloot, married in Den Haag on 26 June 1912 to Maurits Blom, son of Mozes Blom and Sophia van Praag.
Digital Family Tree of Den Haag, index marriages Maurits Blom .
In addition, a Jokos file (number 32010) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.