However, we do know the following about them:
* Hans and Rosa had three children. Two died in their youth, leaving only one who survived to adulthood.
* The surviving child was a girl. She was older than Liesel Meminger, as she had left home and moved away before the story begins.
* The surviving daughter never returns to live with her parents. This is significant because it shows the impact of grief and hardship on their family dynamics.
While we never learn their names, their absence is a poignant reminder of the loss and hardship experienced by the Hubermanns, and the enduring impact of war and trauma on families.