Since I live in China, I can't use Dropbox since the government finds all file-sharing and file-storage services a threat to their survival and control of the people. Since Kobo won't let me push books to it from a remote location, it is out of the running.
My Dad won't use a tablet, like iPad, since he has no use for computers at all. I don't think he has ever looked at a computer monitor. He liked the Kindle DX since he could just pick it up and turn it on and read.
Honestly, I don't know if the buttons made things easier or worse for him due to his arthritis. Thinking about it now, he does read paperbacks so the smaller size should not be an issue.
What I am going to do is either order him a new Kindle or ship my older model back to Canada for him. The advantage of giving him mine is that I can load it with books he will read. Also, I win since I can then get a newer one for me.
Thanks for the assistance.