There is an essay by Heere Heeresma in which he describes the deliberation about the going into hiding of the surviving child from this family.
H. Heeresma, 'Het geval Schlesinger' (Hakehilla, 23 chesjwan 5728/20 november 1967, 10-14)
In addition, a Jokos file (number 34932) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
Addition