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The Calibre is only on your computer?
It could be more to do with your computer than Amazon or the Kindle4PC app. If your Kindle4PC app and Calibre are on the same computer, you may have some setting that is allowing your specific Kindle4PC app to see the mobi files, whereas your son's Kindle4PC app is potentially on a different computer or perhaps even just using a different folder or settings that can't see the actual Mobi files.
It may have nothing to do with the actual Kindle or Amazon website.
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