What are three flashbacks Bruno has in the boy in the striped pyjamas?

In "The Boy in the Striped Pajamas," Bruno has several significant flashbacks. One flashback recalls a time when he and his family lived in their comfortable home in Berlin, highlighting his past innocence and the warmth of family life. Another flashback involves memories of playing with his friends in the neighborhood, emphasizing his longing for companionship. Finally, he recalls moments with his grandmother, who disapproved of his father's job, hinting at underlying tensions within his family regarding their circumstances.