What happens when the children, including Richieu, are sent to live with Persis, a Jewish officer in Zawiercie?

The year is 1943. All Jews are forced to leave Sosnowiec for a ghetto in the nearby town of Srodula. One night Persis, an uncle of Anja's brother-in-law, arrives. He is on the Jewish Council in a nearby town and wants to take Anja's sister Tosha, her husband Wolfe, and their daughter Bibbi to live with him in nearby Zawiercie, where he has some influence and thinks he can keep them safe. He wants to take Richieu with him as well, and Vladek and Anja agree. The parents watch as he takes Richieu away. It is the last time they will ever see him. A short time later, all the children in Srodula are rounded up to be killed, and the parents are glad that they have sent their son away, but the Zawiercie ghetto is liquidated shortly thereafter. Rather than be sent to the gas chambers, Tosha poisons herself, her children, and Richieu. Vladek and Anja are not made aware of this until much later.