I was a junior when my brother was a freshman. He was in a dorm and I was in an off-campus apartment. We didn't see each other that often, but we talked several times a week.
So, what's your point, that you had a lousy older brother?
-PJ
The point was that using the fact both were in the same dorm, could not be used for some form of verification he knew anything at all factual about the subject.