Elisabeth Boisen was granddaughter of N. F. S. Grundtvig and her father, Peter Outzen Boisen, from 1851 was manager of the Queen Caroline Amalie Asylum School, which Grundtvig was the manager.
Elisabeth Boisen var barnebarn af N.F.S. Grundtvig, og hendes far, Peter Outzen Boisen, var fra 1851 bestyrer af Dronning Caroline Amalies Asylskole, som Grundtvig var direktør for.