Why does Amir ask Mr. Andrews if he has children; AND what is the outcome of the question?

The next day, Amir took Sohrab to the American Embassy to see an official named Raymond Andrews. Amir told him he wanted to take his half-nephew to America, omitting all the information about Assef. Raymond Andrews told him that his chances of getting a visa for Sohrab were slim. He would have to prove that Sohrab was legally an orphan by providing death certificates for Hassan and Farzana; this would have been impossible even in pre-Taliban Kabul. Before leaving, Amir snapped at Raymond Andrews, "They ought to put someone in your chair who knows what it's like to want a child." As he and Sohrab left, the receptionist told Amir that Raymond Andrews's daughter had committed suicide.