 Carin's maternal grandmother had founded a private religious sisterhood, the Edelweiss Society.She was the fourth of five daughters; her sisters were Fanny von Wilamowitz-Moellendorff (1882–1956), Mary von Rosen (1886–1967), Elsa, and Lily.Mary was married to Count Eric von Rosen (1879–1948), one of the founding members of the "Nationalsocialistiska Blocket" ("National Socialist Bloc"), a Swedish National Socialist political party.