I'm a little confused by your post. Assuming you leave the Kindle for your mom on your account, you two can share books right left and sideways. And, since you could both be reading the same book at the same time, it makes the price even better ... it's like getting a fifty percent off deal on every book you buy.
If you are really keen on reading secure PDF, then I would wonder a little why you would have bought a Kindle in the first place ... but then again, I hate it when people second-guess other people's purchases.
In my view, Amazon has most of the books that I want to read, at a price I like, and my Kindle reads them perfectly. I wish I had a family member who had the same reading taste as I do .... I would buy them a Kindle in a heartbeat. Then again .... I've purchased one for a neighbor, and I don't regret that purchase one bit. She is totally non-techie (doesn't own and has never even used a computer), and she LOVES her Kindle.
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