If it has a voice remote, it's a Contour 2. That receiver has more options than a Contour 1. It's the only choice if you want apps or a voice remote. But, if all you want to do is watch live programming and record and playback recorded programming, a Contour 1 is probably the better choice. I'm not familiar with all the features of a Contour 2, but Bruce described how to change the default guide view to favorites. When you display the program guide, the only channels listed would be your selected favorites.
Contour 1 has a skip channels option. If Contour 2 has this feature, you could skip all channels that you never want to see and it would allow you to retain the "Grid View" which is easier to use. Pressing the up or down channel buttons would take you to the next channel that hasn't been skipped. The channels not skipped would be the only channels your father would see.
If your father only watches live TV, he doesn't need apps or a DVR. Unless he likes the voice remote, I would suggest exchanging the Contour 2 box for a more user-friendly Contour 1 (non-DVR version). A Cox Social Media Support Specialist confirmed that Contour 1 boxes (DVR and non-DVR) are available in all markets. I'm not familiar with the non-DVR version, but it probably has the same live TV features as the DVR version, just without the DVR functionality. They might even use the same boxes with the only difference being non-DVR customers aren't subscribed to a DVR service.
In addition to the skip channels option, Contour 1 has other features that could make it easier for your father. If he has one channel that he watches most of the time, you could set it as the "Power On Channel" to make it the current channel when the TV is turned on. You can also configure the Cox remote to turn both the cable box and TV on and off together with one button push.