I agree with Ballistic. One of the major arguments that the WT presents of why the rank and file should not have anything to do with "apostates" (word used very liberally) is that "they pull you out and then leave you with nothing." Although we all know the faults of the organization there are some people that literally NEED it. They do not want to think for themselves, they want someone to tell them what to do and that everything is going to be all right. Some have found a tremendous amount of strength within the JW that has gotten them through some horrible times in their life.
I don't feel, personally, that someones eternal salvation is in jeopardy because they are a JW any more than if they belong to any other religion. Because of I feel that way, I find it difficult to justify tearing away what is a huge part of somebodies life and happiness, just because I think it would be better for them/me.
When people are ready to see the truth, be right there to present it to them. Until then, be sure that you are there for you little brother and the rest of your family. Demonstrate that you are still a good person and that you truly want what is best for them, whether they remain witnesses or not.