1. What happens to Vladek’s sister Fela? Why does Vladek’s father join her? Explain his thinking.

When the jews were sent to the stadium to register, Vladek's father is allowed in the line of Mordecai, and he is speared. But before he leaves the stadium, he sees Fela and her children standing in the line with those destined for Auschwitz. He leaves the line of safety and crosses over to be with her. They all die in the camps.