Tech tutorial site Gil's Method details how to download and save web video from YouTube, MySpace and Google Video using the Firefox Video Downloader extension and Media Coder. Why the big rigamarole?
The reason you have to go through this process to download the videos is due to the fact that content providers (YouTube, Google Video, and others) use special formats that do not allow playback in traditional media players (i.e. Windows Media Player, Itunes, and others); as such this method allows you to save the downloaded video files to a universal .avi file that you can play back on any media player.
We've covered this ground a couple of different ways before but this is a good step by step to pass on to your brother.
How-to Download Videos from Websites Like Google Video, YouTube, MySpace, and Others [Gil's Method]