When I look at such a document on my Pocket PC, I have 10 type sizes larger than "normal" and 5 smaller, for a total of 15.
I count only 10 total on Mobi for PC. According to Amazon, the Kindle has 6 total.
So, from "Normal" type size (whatever that really is) on a Kindle, there still be 3 biggers and 2 smallers? It would make sense - as long as it isn't 1 normal and 5 smaller sizes........I just want to make sure it will be big enough for dear old dad to be able to read again.