Evil Mengele used inmates of the concentration camp for his pseudo-scientific medical experiments, inflicting terrible suffering on them and often killing them. Previously, he had experimented mostly on sets of twins but now he saw a new subject for his so-called research.
So keen was Mengele to have the Ovitz family members as his experimental subjects that he ensured that they got very special treatment in the camp. They had their own accommodation, they wore their own clothes and, unlike other prisoners, were not obliged to have roughly shaven heads. And there was no question of them being sent to the gas chambers and ovens.