Greys Anatomy Season 11 Spoilers: How Will Meredith React To Meeting Her New Half-Sister?

How will Meredith react to the news of having yet another half-sister when Season 11 of "Grey's Anatomy" premieres? ABC/Grey's Anatomy

Shonda Rhimes managed to leave Greys Anatomy fans with their mouths agape once again with the final scene of the Season 10 finale. The twist? Cristina Yangs replacement, Margaret Pierce, played by Kelly McCreary, is actually Meredith Greys half-sister.

It was Dr. Webber who learned the thrilling fact first when Maggie, the new head of cardio, suggested she had applied to Grey Sloan Memorial Hospital because it was where her mother, Ellis Grey, had worked. Yep, not only is Margaret Merediths young sister, but shes also Dr. Webbers daughter! Hows that for a daddy-daughter reunion?

How will Meredith react to yet another half-sister falling into her scrubs? Well, Rhimes told all when the medical drama mastermind sat down with TV Guide for an interview.

Rhimes explained that the role of Maggie had been an idea waiting to be carried out since the series premiere in 2005.

That was one of the original pieces of story since the beginning with the Richard-Ellis dynamic, but it's been a piece of story since Season 4 when we talked about introducing her, Rhimes explained, adding that she had to wait until the perfect moment to introduce this game-changer.

We were holding it forever. I kept going, Not this season, it's not right. After a while, I was like, We're never going to introduce it. The show is going to end without it. Every time I thought the show was going to end, I was like, Ah! Then we hit this moment in time and I remember walking into the writers' room and going, You guys, it's time. And all the writers knew exactly what I was talking about.

Rhimes divulged that Maggies debut will be an interesting situation to watch play out.

"Grey's Anatomy" creator, Shonda Rhimes, explained that the character of Maggie will be very interesting to watch play out in Season 11. ABC/Grey's Anatomy

Because we've all known about it for so long, it's always been layered in. It's not a thing where we're going in and backdating. It's literally always been layered into the story line. We can literally go back and pull out moments of the show and I'm excited to do so, and point out where it was talked about. It's not going to be so hard to do, she revealed.

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Greys Anatomy Season 11 Spoilers: How Will Meredith React To Meeting Her New Half-Sister?