Who is great aunt birdie in number the stars?

Great-Aunt Birdie is a character in Lois Lowry's novel "Number the Stars." She is the aunt of the protagonist, Annemarie Johansen, and is a supportive presence in the story. Birdie is a former member of the Danish resistance during World War II, which adds depth to her character as she represents the courage and resilience of those fighting against the Nazi occupation. Her character symbolizes the importance of family and the legacy of bravery passed down through generations.