Joël Denneboom was the son of Abraham Denneboom and Rebekka Rolina Danneboom. Martha Hoogstraal was the daughter of Hartog Hoogstraal and Geertje Nieweg.
Joël Denneboom and Martha Hoogstraal had three children: Elli Hermanna, Carolina Geertje, Geertje Regina. Both Carolina and Geertje lived at the Apeldoornse Bos. Geertje was a nurse there.
Addition of a visitor of the website
In addition, a Jokos file (number 8373) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.