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I don't think that there are any ebook readers that are more drm friendly than others.
On the one side you have Amazon with mobipocket files and it's huge shop behind but you are a little bit restricted to one shop.
On the other side you have a number of epub devices like Sony, Kobo, you have more shops to choose from.
I don't know where you live, if removing copy right protection for personal use is allowed in your country and if you or your father want to go this way. From a technical point of view, it is no problem, google for apprentice alf and how to use it with calibre.
I would suggest that you don't care about drm-friendliness and so on. It is an annoyance in any case. Look, which reader your father likes best, from the handling, from the screen, from the fonts, from loading and buying books.
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