This is the first of a two-part column. The second part will publish on Friday.In a breach of fiduciary duty case involving three factions of feuding “partners” and a limited liability company (Combined Group LLC, or Combined) that was managed by a closely-held corporation (Combined Holding Group Inc., or CHG), the first question for the Illinois Appellate Court was whether a Cook County judge erred in ruling that Mark Oliver owed a fiduciary duty to Combined based on the fact that he was one of three equal …