Hannah Klein

Hannah Klein is daughter of Izzie Stevens who was given up for adoption. Izzie encountered her parents at Seattle Grace Hospital and found that she had leukemia. Izzie then donated her bone marrow to Hannah to save her life.

Personal life
Izzie Stevens had a child at 16, and being unable to care for her daughter, she gave her up up for adoption. Years later, Hannah's adoptive parents came to the hospital looking specifically for Izzie, as Hannah had leukemia. Initially reluctant to do anything for Hannah as she would only be, at best, a half match for Hannah, she eventually decides to go through with the donation, confiding in Bailey only. Bailey attempts to keep this secret under Izzie's wishes, until Meredith tells George that Izzie is undergoing a procedure, where George takes over from Bailey.

When Izzie wants to see Hannah, her parents claim Hannah is tired and Izzie is unable to see her. She does, however, get a glimpse of her in her hospital bed through the windows.