lol, what he said. In October I'm giving a course on Windows basic skills (just one step up from 'what is a double-click?').
Try to keep explanations short and to the point, but repeat often. Best not to try to teach the person you live with :-D The more space between you the better, for both of you ...
Start with things like copying/moving files, using programs that the student can identify with, and work up gradually.
