'Grey's Anatomy's' Caterina Scorsone: Amelia Isn't the 'Black Sheep' Anymore With Derek

ABC/Adam Taylor

"Grey's Anatomy's" Patrick Dempsey and Caterina Scorsone

[Warning: This story contains spoilers from episode 1107, "Could We Start Again, Please?" of ABC's Grey's Anatomy.]

Amelia Shepherd (Caterina Scorsone) and her big brother, Derek (Patrick Dempsey), may finally be on equal ground.

The siblings clashed in a major way during Thursday's episode when one of Amelia's fellow Narcotics Anonymous members outed her dark and sad backstory. It threw the head of neuro's career in jeopardy after the surgeon worked tirelessly to rebuild from the mental, physical and emotional distress caused by her drug addiction, boyfriend's death and delivering a baby without a brain.

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But the worst part was that the doc received the opposite of support from Derek after she moved from California to Seattle to help him after he planned to take a job in D.C.

"It changes what Amelia understands of their dynamic," Scorsone tells The Hollywood Reporter of Derek's decision to not immediately support his sister. "She's always seen herself as the black sheep of the family. He's always been this generous benefactor to her. We have a reversal happening. She came to Seattle to help him with his life, and he's pulled the legs out from under her."

And he really did: After Owen (Kevin McKidd) asks Derek if Amelia should really be the head of neuro, the eldest Shepherd says he can't answer that largely because his sister took his job when the surgeon was likely headed for D.C. It leads to a board meeting where Derek eventually does back his sister, but it comes after Amelia finds out about his failure to support her and lashes out at him and vows to move out of the Dream House.

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'Grey's Anatomy's' Caterina Scorsone: Amelia Isn't the 'Black Sheep' Anymore With Derek