What does Amir make sure the General understands?

The General asks about Sohrab – why did Amir bring a Hazara boy back? Khanum Taheri and Soraya try to intervene, but Amir stands up for himself and tells the General very bluntly that Sohrab is his nephew. He tells the General about Baba and Sanaubar and Hassan. And gives the General a little piece of advice: "You will never again refer to him as 'Hazara boy' in my presence. He has a name and its Sohrab" (25.98).