This sub-series contains correspondences with numerous relatives, including numerous members of the Friedländer, Bergmann, Haase and Lichtenstein families, most forced to flee Nazi Germany because of their Jewish heritage, eventually settling in the United States, England, Israel and Australia. Among the correspondence with friends included in this series, are lengthy correspondences spanning four or five decades with Irma and Erich Berndt, Paul and Käte Brün, Alfred and Charlotte Dresel, Leo and Anne Marie Grebler, Isa Gruner, Werner and Hanna Heider, Mario and Dorothee Iona, Paul and Regina Kägi, Robert M.W. and Benedicta Kempner, Robert and Herthi Liebknecht, Dyno and Mara Löwenstein, Adolf and Elisabeth Lüchinger, Hilde and Hardi Meisels, Hans and Käte Siegel.