What argument does Nadira have with Uncle in Section 5: Chapter 6? What excuse does Auntie give?

Uncle dresses for his catering job as he does every day, though he does not often get called to work anymore. Uncle mocks Nadira's future laziness in Canada, suggesting they need to stop asking Allah for so much since it just gets taken away. Auntie explains Uncle is scared because his work friend was imprisoned by the INS.