Episode Name: The Hardest Part
Air date: 3/31/2011
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.  

Watch or download Private Practice – Season 4 Episode 18 – The Hardest Part at below links.