This big step forward by comic writer-director Noah Baumbach (Kicking and Screaming, Mr. Jealousy) is a tragicomic autobiographical account of the breakup of his parents' marriage. The father (Jeff Daniels) and mother (Laura Linney) are both fiction writers living in Brooklyn, and their determination to remain liberated about sexual matters as they separate and divorce drives their two sons (Jesse Eisenberg and Owen Kline) nuts. The implied critique of progressive, bohemian parenting is devastating--wise and nuanced, with the painful hilarity of truth. With William Baldwin and Anna Paquin. R, 88 min. Century 12 and CineArts 6, Piper's Alley.