What is the main obstacle in Amir's being able to adopt Sohrab? What does Raymond Andrews advise Amir to do?

A man at the American Embassy in Islamabad says adopting Sohrab is impossible, due to the fact that Amir would need death certificates of his parents (Hassan and Farzana), when most people in Afghanistan hardly had birth certificates. Also, he would need to prove that Sohrab is really his half nephew, which was nearly impossible as well. However, he still gives them the name of an immigration lawyer. He tells Amir to consider adoption.

Amir and Sohrab go to the American Embassy. Amir needs to look into the logistics of adopting Sohrab. While Sohrab sips some lemonade in the lobby, Amir talks with an official there named Raymond Andrews. The news isn't good: chances are the adoption won't go through. Amir doesn't have any way to prove Sohrab's parents are dead and neither does he have any proof he's Sohrab's half-uncle. Raymond Andrews says Amir should just give up. However, as Amir leaves, he hands Amir the business card of an immigration lawyer.