Hi red_saphyre -
Kudos to you for trying to understand your brother. It will go a long way toward strengthening your relationship with him. I have a daughter with Aspergers and I see her younger sister struggle with it sometimes.
I have found a website that seems to handle the subject well. I've included a link to the "Asperger siblings" section, but there's a lot more to the website that seems worth exploring. The siblings section seems to be written for a younger audience, but the same issues still apply I think. Here's the link:
http://www.asperger-advice.com/asperger-siblings.html
It is written by a master's level educator who is also a nurse, so I think she's an accurate resource.
I wish you and your brother well.