(4) Professional Goals:
What does your brother want to do in his legal career? If he wants BigLaw or Clerkship then I think Emory has a bit more prestige than UW, but biglaw is hard to come by and most people hate it. If your brother wants to be a Public Defender or City Attorney he may want to stay at the school he is attending and negotiate for scholarship money. There are a lot of career paths in the legal field, but if your straddled with outrageous debt it can limit opportunities.
U.S. News Rankings
You mentioned ranking as a factor in your post, but please realize U.S. News is a for-profit and unregulated magazine offering an opinion nothing more. It should not be the basis of a life altering decision. To illustrate this U.S. News ranks more than law schools and has ranked Albuquerque New Mexico as the #1 place to live see here http://money.usnews.com/money/personal-finance/real-estate/articles/2009/06/08/best-places-to-live-2009
they had their reasons none of which are crazy, but you are probably not going to move to Albuquerque because U.S. News ranked it #1 making the life altering decision to move to a new city based on a magazine would seem a bit crazy.
Making the life altering decision of what law school to attend based on what a magazine says makes as much sense. The U.S. News formula makes little to no sense and I personally have no idea what difference in rank there is between UW and Emory nor do I care. Both schools are fine and UW being 38th and Emory being 46th would make no difference especially since the numbers will change next year and it would be not be surprising at all if the lower ranked school was ranked higher next year when your brother is a 3L.
Bottom line do not place much stock in the rankings when choosing a law school.
Reality of Legal Education
Your brother finished his 1L at an ABA school I have no idea which one he attended, but I am sure he learned about personal jurisdiction in the International Shoe Case, he learned proximate cause in Palsgraf, and he learned Notice in Pennoyer v. Neff.
The reality is that at any ABA school you will learn the same thing law school is reading Supreme Court cases and understanding them. The Supreme Court does not write separate opinions for each law school and whether your brother stays where he is, Emory, or UW he will more or less learn the same thing.
When he graduates whether from his current school, UW, or Emory he will then signup for Kaplan or Barbri and study with law students from across the country for a bar exam for a few months. Then he wil be in a room with thousands of other law students from across the country taking a bar exam and if he passes he is a lawyer. If he doesn't he will have to retry none of the schools will guarantee passage or a job it will be up to him to pass the bar and succeed as a lawyer.
This is a huge decision and if his ultimate goal is to end up in D.C. he should get as close geographically to D.C as possible so Emory would be better than UW. If his current school is in D.C. then he would probably be better off staying there.
However, if he is not hell bent on practicing in D.C. UW is significantly cheaper than Emory and the debt is real. However, he can likely command scholarship money from his current school and that may be an option.
There is no right answer, but it should be a simple matter of the 4k scholarship and U.S. News ranking that makes this huge decision. I wish your brother good luck in his legal career.