Six days before the liberation of Auschwitz, one of my ancestors was transferred from there to Buchenwald. He died either in Buchenwald or most likely on a forced march from there, as the prisoners were moved in advance of the liberation of the camp.
His younger sister and younger brother had not been arrested because they were at school when he was arrested along with his older sister, mum and dad, and these three died in Auschwitz. The younger sister gave a testimony which is at the Shoah Memorial in Paris, without which I would be unaware of what happened to these four ancestors, and later on found out about a fifth.
Five of the six million who died.