Margot at the Wedding(2007)

Margot Zeller is a short story writer with a sharp wit and an even sharper tongue. On the eve of her estranged sister Pauline's wedding to unemployed musician/artist/depressive Malcolm at the family seaside home, Margot shows up unexpectedly to rekindle the sisterly bond and offer her own brand of support. What ensues is a nakedly honest and subversively funny look at family dynamics.