Who was tommos brother and sister in private peaceful?

In "Private Peaceful" by Michael Morpurgo, Tommo Peaceful's brother is Charlie Peaceful, and his sister is called Beatrice, often referred to as "Bee." Charlie plays a significant role in the story, showcasing a strong bond with Tommo, while Beatrice represents the family's love and the innocence of their childhood. The dynamics between the siblings are central to the themes of loyalty and the impact of war on family.