I believe that the movie "The Farewell" has one of the best portrayals of family dynamics in modern cinema. The film explores complex family relationships, cultural differences, and the dynamics of a multi-generational family. What makes it realistic is the authentic dialogue, the nuanced performances by the cast, and the way it delves into the complexities of family bonds, love, and communication. The film also highlights the importance of tradition, duty, and sacrifice within a family setting, making it a compelling and relatable portrayal of family dynamics.