Brothers and Sisters (2006)

S4E5 Last Tango in Pasadena

The Walker family, apart from Nora, is taken in by the allure and tango lessons of Luc Laurent, Sarah's latest beau. However, Nora soon realizes that her French visitor provides invaluable support during a challenging period. At the same time, Robert seeks to divert Kitty's attention from her battle with cancer, pouring his heart into romantic gestures to uplift her spirits.