What does Nadira relate of her sense of moral goodness in Section 6: Chapter 7? How does she relate this to her ancestry?

Nadira notes that Bangladeshis always keep going and try to do the right thing. She tells about Naseem, Abba's older brother, who was killed when he joined the Mukti Bahini, a group of freedom fighters. When Abba saw Ma at a Bengali New Year fair, he saw the shy, fearless girl he must marry, and he refused to eat until his father arranged their marriage.