Grey's Anatomy Season 12 Episode 21 Promo

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Richard's changed his tune when it comes to advising Arizona about her custody troubles. 

Even Callie knows this case is going to turn nasty, and make Sloan-Grey an uncomfortable work environment for a while. At least she plans on leaving it all behind for New York.

The race is on to convince their friends to act as character witnesses.

But who will side with whom?

Karev, with his position as chief of pediatrics, would be great to have in your corner, and Arizona was his mentor. 

But Meredith is a mother, which surely would weigh well with a judge, and has been close with Callie since George died.

Will Callie and Arizona be able to get through the hearing? Will their friendly co-parenting relationship survive this battle? Will their friendships with the other surgeons?

You'll have to tune into Grey's Anatomy Season 12 Episode 21 on Thursday to find out!

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Grey's Anatomy Season 12 Episode 21: "You're Gonna Need Someone On Your Side"
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Grey's Anatomy Season 12 Episode 21 Quotes

April [to Arizona]: What did you just see? You stopped talking. Your mouth smiles, but your eyes keep thinking. It's that thing that you do when...
Jackson: April,I'm pretty sure she's just smiling.
April: No, it's that thing that you do when you have bad news and you don't want to say it.

Meredith [to Owen]: I tell my kids, when you're finished with your toys, put them away.
Richard: Uh, good morning.
Meredith: My kids don't need to see your penis, so the same goes for you.