Most, if not all, of the books on this page have been written by other authors as part of authorised series. If your book really is written by the twins, please edit the work's authors and add both Mary Kate Olsen and Ashley Olsen as individual entries.
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Mary-Kate and Ashley Olsen is currently considered a "single author." If one or more works are by a distinct, homonymous authors, go ahead and split the author.
Mary-Kate and Ashley Olsen is composed of 11 names. You can examine and separate out names.