Best bet is to rent in the meantime, build credit via credit card, car loan, etc and plan ahead with a lender.
A local bank would be your best bet. Depending on your brothers tax returns, they may be able to work with him. Another suggestion would be if your brothers company has a credit union.
If your brother has no credit history then it is unlikely under the current lending environment that he could be approved for mortgage financing. I recommend that he meet with a Local Mortgage Banker to get prequalified for mortgage financing. The Mortgage Banker will review all facets of his loan request to answer questions with regards to the types of loans and maximum loan amounts he could qualify for.
Your brother's best best is to 1) find himself a good Buyer Agent who will 2) recommend local Loan Officers who will be able to determine if he is eligible for a loan.
A good Buyer Agent has a list of Loan Officers for various types of Buyers.
Please feel free to contact me at Joyce@JoyceLin-RE.com to discuss his options, I specialize in Buyer Agency.
Best of luck to him!