To share Adobe ePubs without stripping DRM you need to use the same AdobeID. The nice thing about AdobeIDs is that they are not tied to a store or to credit cards. So you can both have separate accounts at one or more ebook stores, but still share ebooks by using the same AdobeID.
The exception is the Sony store, which does know your AdobeID and so you would have to experiment to see if two accounts with the same AdobeID works there. Two good alternatives to the Sony Store are Kobo (make sure they have an Adobe version of the ebook before buying) and Books on Board.
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