According to TV Guide, "Grey's Anatomy" has another crossover episode planned with sister show, "Private Practice." In an episode slated to air in mid-February, Derek's (Patrick Dempsey) sister, Amelia (Caterina Scorsone) will journey to Seattle Grace, and in the following hour, Derek and Lexie (Chyler Leigh) will visit California. There is no word on specific storyline details yet.
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