SPOILER ALERT: Dont read further until youve watched season 15, episode 21 ofGreys Anatomy, Good Shepherd.
And boy, is it one mother of a get-together.
ENTERTAINMENT WEEKLY: Why are your sisters so mean?CATERINA SCORSONE:I dont know!

Credit: Mitch Haaseth/ABC
I had that same thought.
I went, really?
We had a blast off-screen.
I think probably deep wounds in their psyches.
I can only imagine the kind of trauma that comes from losing your father at such an early age.
That created some pretty hard wounds for them.
They want to blame her or categorize her to keep themselves safe.
Thats my psychological analysis.
She is still carrying around this idea that she was bad and it was all because of her.
She has a really clean side of the street, for the most part.
Shes a neurosurgeon and has wonderful friendships.
She takes care of people.
Shes a good person at this point.
I think she is able to release the part of herself that is pulled back into that story.
Instead of going, Why isnt she likable enough for them?
I dont like them.
So why am I trying to paddle upstream and prove myself to people who are mean to me?
That was a liberating moment for her.
Did she get closure from her mother?I think so.
First of all, working with Tyne Daly was one of the absolute highlights of my creative life.
She is such an incredible woman.
We have so many incredible conversations.
I think Amelia didnt even know she needed to see her mom.
Her mom offered her apology generously and courageously.
That had all kinds of psychological consequences for Amelia.
Her mom was able to say that, that it was not all Amelia.
She participated in a broken psyche.
Shes sorry for that and she believes in her, that shes smart and strong.
Amelia can put these puzzle pieces together and go on and have a fantastic life.
She validated her experience.
Will we see your sisters again?I hope so.
That dinner scene, they were so brutal to Amelia!
Nothing is set in stone.
I thinkChris Carmackis great.
He is so fun to work with.
But the writers keep saying we dont know!
I say, Is it happening?
And they said, We dont know.
Greys Anatomyairs Thursdays at 8 p.m.