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Probably the simplest way is for them to install the Kindle app on their Android tablet, then give you the Kindle email address for one of their devices. Then you can email the ePub version of the book to the Kindle address from Calibre and it will get converted and available to both devices as Personal Docs (rather than Books, which is reserved for ebooks bought from Amazon). They won't get covers, but their reading progress will sync between devices as will annotations.
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