PRIVATE PRACTICE - "Andromeda" - Sam tries to take care of his sister, Corinne, but her mental condition makes that nearly impossible; Sheldon learns that Amelia has life-changing news; the flirtation between Addison and Jake continues, and Cooper rejects Charlotte's suggestion to seek outside help with Erica's care, on "Private Practice," THURSDAY FEBRUARY 23 (10:01-11:00 p.m., ET) on the ABC Television Network. (ABC/KELSEY MCNEAL) BENJAMIN BRATT, KATE WALSH