How does moral corruption transfers from parent to child show up in the novel?

Dr. Rank has inherited his tuberculosis from his father, who lived a morally questionable life, and in much the same way Nora worries that her morally reprehensible actions (fraudulently signing her father's name) will infect her children. Corruption, the play suggests, is hereditary. As he does in other plays, such as The Wild Duck, Ibsen explores the tension between real life and moral ideals.