My brother is two and a half years older, milder aspie. Protected me as a child, the only one I ever felt close to when i was little, and I don't know what I'd do without him.
Asperger affected him in this way that he was so introverted that he stopped talking when I was about nine or ten, not selectevely mute, just saying very little and not wanting to spend time with anyone, including family. He kept his few friends, though, but barely spoke to them when they visited him.
My neurotypical sister is five years younger. She's a beautiful person in and out, but she lives far, and I dont get to see her much. We were never close, and I'm sorry about that, but this is how Asperger has affected me, too.