 His first cousin once removed (also a Hochstetter descendant) was Kurt Weill (born 2 March 1900 in Dessau and died 3 April 1950 in Haverstraw, New York), the famous music composer of "The Threepenny Opera" and "Mack the Knife" who married Lotte Lenya (born 18 October 1898 in Vienna and died 27 November 1981 in Haverstraw, New York), the famous Austrian singer and actress.Caesar's younger brother was Professor (born 12 May 1873 in Mannheim and died in 1942 in Theresienstadt concentration camp), Professor of Literature at the University of Brussels, writer and poet and friend of Wilhelm Busch.Another first cousin once removed was the childhood prodigy pianist, Lisy Fischer (born 22 Aug 1900 in Zurich, Switzerland and died 6 June 1999 in Newcastle upon Tyne, England), with whom Caesar was in regular contact (she also lived in Switzerland), whose career he followed and to whom he gave support and encouragement.