How about trying out another type of mouse on him? There are a couple of different kinds that come to mind. One is called a track ball, which has as you might guess, a big ball in the middle of it that takes care of most of the mouse movements. There are button on the side of the device that do various things, too. I have a co-worker that uses that type of mouse because he has carpal tunnel syndrome, but I'm sure other people with special needs could benefit from this as well.
The other type of mouse (which I personally don't like) is one that's more like a tracking screen, very similar to the mouse that you see on a laptop.
Would either one of these be something your dad could use?
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