Watch Private Practice S04E18 Season 4 Episode 18 “The Hardest Part” Stream Online Free. The latest episode of Private Practice, S04E18 Season 4 Episode 18 with title “The Hardest Part” will be aired on Thursday March 31st, 2011 on ABC. In this episode is about, Pete becomes suspicious of his brother Adam and his role in their mother’s illness. Meanwhile, Violet accidentally finds out that Sheldon is dating her archenemy. And Cooper’s patient is a musical prodigy with a debilitating brain tumor…..

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Summary :  When Pete’s brother, Adam, brings their sick mother for a consult, Pete discovers her illness may be his brother’s fault. Meanwhile, in the wake of her book’s success, Violets walks in on Sheldon just as he’s about to take her archenemy on a date, and Cooper treats a young musical prodigy whose brain tumor could prevent him from ever playing the piano again.