As all Jahns know, those descending from Mutti's husband, Konrad Jahn, are also 'von Dieskaus.' Konrad's mother was Dorothea von Dieskau. Her younger sister Emma married Albert Fischer and they had a son, Konrad's cousin, named Albert (who later added his mother's maiden name and was known as Albert Fischer-Dieskau). He, of course, was the father of our second cousin, twice removed, Dietrich Fischer-Dieskau.
Remembering our gathering in Chattanooga to celebrate our heritage, as we are to each other, so were our grandparents (Jack, Dora, Richard, Paul, Erich) second cousins to Dietrich Fischer-Dieskau.
http://www.washingtonpost.com/entertainment/music/dietrich-fischer-dieskau-master-singer-of-german-art-songs-dies-at-86/2012/05/19/gIQA2zixbU_story.html