in what important respect did hans junior differ from his father?

Hans Junior is a nationalist. The father and son argue fiercely; Hans Junior accuses his father of being disloyal to Germany and asks why Liesel isn't reading Hitler's book Mein Kampf. Hans Junior then calls his father a coward for doing nothing while "a whole nation cleans out the garbage and makes itself great" and storms out. Death explains that Hans Junior would end up at the Battle of Stalingrad, where Death was extremely busy carrying the souls of dead soldiers.