The only issue to be aware of when using one Kobo account is that whichever reader syncs last sets bookmarks and reading status on the kobo server, website, and desktop application. Two people syncing can be difficult if they are reading the same book at the same time. In our house, my husband syncs and I use Calibre or ADE--no issues. Both of you should use the same ADE account, btw, so there are no problems with locked books.
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