if its a federal loan (stafford or the like) you have 6 months grace period before you have to start paying back the loan. so basically, if your brother doesnt have a job now, he can wait max of six months b4 consolidating. personally, i'd wait till the end of my grace period to consolidate....cuz once you consolidate, you have to start paying.
i dont have the link, but you can google dept of education. call them up and ask them about consolidating. they will be able to direct u properly. id stick with a reputable company. also ask for various quotes on APR b4 you sign anything. they might be half a percent off from each other, but why pay more than you have to. basically the dept of education CSR will tell u everything
edit: im gettin 2.75% APR. i'll try to find the phone numbers when i get home tonight. but wont be able to post till tom cuz my HD is fried @ home
edit2: also u cant consolidate a non federal loan and a federal loan into one. like i have stafford loans and a NJCLASS loan. i coundnt consolidate those into one