La Bûche

Christmas, family, and infidelity. Yvette's husband has died, and her grown daughters join her at the grave: Sonia, wealthy, bourgeois, and generous; Louba, living with their dad Stanislas, singing at a Russian restaurant, penniless, the mistress for the past 12 years of a man who will never leave his wife; Milla, the youngest, acerbic, lonesome. Christmas was when they learned their parents were divorcing 25 years ago.... (imdb)