What happened after the last play's performance with Grandmother in the boy in the striped pajamas?

After the last play's performance in "The Boy in the Striped Pajamas," Grandmother expresses her discontent with the family's situation and the changes brought about by the war. She is upset with her husband’s job and the moral implications of their lives. This moment highlights the growing tension between the family's values and the harsh realities of their circumstances. Ultimately, it foreshadows the tragic events that will unfold as the story progresses.