Private Practice - Caterina Scorsone, Grey's Anatomy - Patrick Dempsey

Grey's Anatomy fans had to know this was coming.

From the moment Caterina Scorsone signed on to play Derek Shepherd's sister on Private Practice, fans wondered: When will the family reunite? They need wonder no more, because executive producer Shonda Rhimes tells TVGuide.com exclusively that the shows' writers are already discussing a crossover.

Grey's Anatomy: Will Meredith go all dark and twisty again?

"I would love to see what happens when Derek [Patrick Dempsey], his sister and their mom — because I love Tyne Daly — get together," Rhimes says. "I think that would be very interesting to see. We're talking about possibly thinking about that for next season."

We're just spit-balling here, but last week's revelation on Private Practice that Amelia and Derek both witnessed their father's death — which lead to Amelia overdosing and dying for three minutes — was pretty heavy. It can't just sit there without being touched, right? Especially since Derek's Post-it wife Meredith (Ellen Pompeo) also died for several minutes at one point. Just us?

Private Practice: Are Addison and Sam meant to be?

What would you like to see for the crossover?