Manfred Grier lived in the youth aliyah home in Loosdrecht, the Paviljoen Loosdrechtse Rade, from 30 April 1942 until 10 August 1942. He then moved to Amsterdam.
In addition, a Jokos file (number 55580) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.