PRIVATE PRACTICE - "Too Much" - Sam finds his estranged sister, Corinne, in jail, heavily medicated and near-catatonic, and brings her to Sheldon for help; Erica begins secret treatments for her cancer and refuses to let Cooper and Charlotte tell Mason; Cooper, Pete and Addison treat the baby of a drug addict; and things between Violet and Scott continue to heat up in the bedroom, "on ABC's "Private Practice" THURSDAY, FEBRUARY 9 (10:02-11:00 p.m., ET) on the ABC Television Network. (ABC/VIVIAN ZINK) KATE WALSH, TAYE DIGGS