Louis van Thijn was married in Amsterdam on 27 May 1942 to Roosje IJzerman, daughter of Mozes IJzerman and Roosje Theeboom.
City Archive of Amsterdam, archive card of Sophie IJzerman .
In addition, a Jokos file (number 12006) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.