UNITED STATES – NOVEMBER 15: GREY'S ANATOMY – "Six Days" – After a successful operation on his heart, George's father undergoes surgery for his cancer, Thatcher Grey visits Seattle Grace in order to see his new granddaughter, and Meredith discovers that Derek has trouble sleeping soundly, on "Grey's Anatomy," THURSDAY, JANUARY 4 (9:00-10:01 p.m., ET) on the Disney General Entertainment Content via Getty Images Television Network. (Photo by Michael Desmond/Disney General Entertainment Content via Getty Images)
