Jacob Frankfoorder and Vrouwtje Halberstad had a child in 1942 that survived the war. See for further details:
D. Meijer, Onbekende kinderen: de laatste trein uit Westerbork (Amsterdam 2001)
In addition, a Jokos file (number 17241) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.