Viktor Freiherr von Weizscker was the uncle of German mathematician and philosopher who was the last-living member of the team which performed nuclear research in Germany during the Second World War.
Viktor Freiherr von Weizscker (21 April 1886 in Stuttgart  9 January 1957 in Heidelberg) was a German physician and physiologist. 
 He was the brother of Ernst von Weizscker, and uncle to Richard von Weizscker and Carl Friedrich von Weizscker. 
Carl Friedrich Freiherr von Weizscker (28 June 1912 28 April 2007) was a German physicist and philosopher. 
 He was the longest-living member of the team which performed nuclear research in Germany during the Second World War, under Werner Heisenberg's leadership. 
