I HATE that look! And, at least in my case, the lectures that follow. I usually respond to the question with, "I help my grandparents." (I do) but that is always inevitably followed by that second, "No, but what do you DO?" When they learn I don't have a "real job", the lectures on employment begin yet again with "suggestions" on where to look for work. It's almost as if, not only do people not understand, it's like they don't want to understand.