Rachel Ketellapper (she was unmarried), had a sister and two brothers: Jetje, Marcus and 476314|Simon)), who resided with their families at other addresses.
City Archive of Amsterdam, archive card of Isaac Ketellapper .
In addition, a Jokos file (number 50621) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.