What finally laid the ghost of Liesel's brother to rest?

Michael Holtzapfel is one of Frau Holtzapfel's sons, Michael served in the German Army in the Battle of Stalingrad, where his hand was severely wounded. At a makeshift hospital, he sees his brother Robert die. He returns home and later commits suicide, unable to live with the guilt of having lived while his brother died. Frau Holtzapfel' is forever lost in the fog over her son's death. This certainly might have put to rest Liesel's guilt over her brother dying.