This isn't Barefoot Gen is it? His brother wasn't suppose to survive. His little brother and his family die in the fire. His mom gives birth to his little sister after he meets her again after the bomb has hit. This is also after he teases a soldier because the soldier just shat blood all over his pants and didn't notice it. My very first anime, saw it when I was 7 and thought it was the greatest thing EVER. First cartoon for me to hear a kid curse without being censored, people dying with some pretty explicit footage shown and a breast.