Maggie's Grey's Anatomy Secret Won't Stay Hidden for Long! Kelly McCreary Gives the Scoop

Meredith Grey (Ellen Pompeo) has one seriously twisted family tree on Grey's Anatomy. And it's actually crazier than she knows!

She even has a half-sister working right alongside her at Grey Sloan Memorial Hospital, and she has no idea!

New doc Maggie (Kelly McCreary) is the result of Meredith's mom Ellis (Kate Burton) and former Chief Richard's (James Pickens Jr.) affair, and though Ellis gave Maggie up for adoption as soon as she was born, she turned up at Grey Sloan Memorial in the season 10 finale to learn all about her biological family.

But as Maggie quickly realized in the season 11 premiere, Meredith is not at all the "warm and fuzzy" sister she was expecting to bond with, and so she's decided to keep her connection to Meredith a secret to everyone except Richardwho she doesn't realize is her father!

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Yeah, we told you it was twisted.

We got McCreary on the line to try and untangle some of the branches of the Grey family tree, and she revealed to us that even though Maggie is determined to keep her family ties to Meredith a secret, it won't stay secret for long. Plus, she dished all about what to expect from the "Maggie-centric" episode airing tonight. Check out our full Q&A with McCreary below!

Is Maggie really going to not tell Meredith about their connection after coming all this way to meet her? We all know the truth is going to have to come out eventually and it can't stay secret for long. She's going to try to stick with it for a while. It's hard to open up to somebody who you don't like or to share a really important secret if you don't like them! She did come all this way to find out about her birth family and Meredith is the only lead that she's got. She's going to have to get over herself and I think the draw to know more about Ellis is going to win out.

I loved the scene at the end of the premiere where they both order tequila at the bar. Are we going to see more scenes like that where their similarities come out? They continue to be in conflict professionally in the next episode, they're paired up on a case together and it doesn't go well, so we'll see that they're both super tenacious and very, very confident and competent doctors. They have that in common and they get that from their mother. We saw in the last episode that they already bicker like sisters naturally and that will continue. We'll see some parallel lines being drawn.

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Maggie's Grey's Anatomy Secret Won't Stay Hidden for Long! Kelly McCreary Gives the Scoop