Want to add more organisation to your collection of videos in iTunes? Categorise the videos as TV Shows instead of Movies and then you can group them as you wish. Mac OS X Hints describes the easy steps for organising your video library.
When you import a new movie into iTunes, it will usually be categorised as a movie. Select all the videos you want to set as a TV show and go to the Info settings (Command + I). Under the Options tab, change the Media Kind to TV Show.
Then, under the Sorting tab, put the group name you want to add the video to under the Show field (for example, family videos). Correct the name tag if you want as well.
Once you're done, view your "TV Shows" in the icon view, where all the videos will be grouped under their own icons. Even in the album list view, the videos will be grouped by your categories.
Mac OS X Hints readers suggest other ways to group videos in iTunes, such as using the Groupings tag, which will show up in the column view in Movies (or other type), or to create custom genres for the video files and then display by Genre. The TV show hack, though, retains the grouping in more types of views and it also will stay organised by group on an Apple TV.