Brothers & Sisters (2006) - 4x05 - Last Tango in Pasadena

The entire Walker family, except Nora, are literally swept off their feet by the charms and tango lessons of Sarah's new lover, Luc Laurent (Gilles Marini). But Nora quickly finds that her new French houseguest is a great comfort during a very difficult time. Meanwhile, Robert puts forth his most romantic efforts to distract Kitty from cancer, and Kevin and Scotty stumble on an unexpected surrogacy candidate