I live in New York and I'm definitely going to get tickets to see her!!!! When she sang on grey's in "Staring at the Sun" she was amazing and I'm sure she's going to be just as good in Chicago.
I was just looking on www.spoilerfix.com/grey.php (its pretty reliable for greys spoilers) and this is what it says for a spoiler for an episode in the spring:"Nathan: Male intern, mid 20's, Bi-racial. He is smart and funny; a boy next door type. Recurring Guest Star"So its the same description (mid 20s, bi-racial) except he's also an intern. And it says nothing about him being Meredith's brother.
Its unlikely given the reasons everyone else already mentioned, but if its true it would be a cool storyline to do.
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