Von Stauffenberg was mercifully shot before the executions were halted and the interrogations/torture began, followed by the excruciating hanging by wire.
The execution area in Plotzensee Prison, where many of the conspirators were executed, has been converted into a memorial to the German Resistance.
I saw an interview of Berthold Staffenberg. He said that he faced some recrimination from his fellow Bundeswehr officers because of his father. There was still very strong feeling that his father was not a patriot, but a traitor.