Because actually just "widescreen" and "full screen" would not be correct, because of the special way this movie was made. The theatrical release of Brother Bear actually used two different aspect ratios during the film- starting with one ratio while Kenai is a human, and then switching to another ratio after being transformed into a bear. The "human" part of the film actually had black bars on the sides of the film (like watching regular tv on a widescreen television) to depict the narrower view of a human. Then when Kenai is transformed, the picture expands to the full theater screen. So the "family friendly" version would probably depict the "human" part of the film correctly, but then crop off the sides of the "bear" part, so that the film would seamlessly be the same size/ratio. The other version would show all of both parts, but the size of the picture would change. Having watched the latter version, I believe that I remember black bars appearing above and below the picture for the "bear" part- switched from full screen to widescreen at that point.
