Writing is so important and "Sibling Rivalry" has the best. Comedy works when the situation continues to surprise rather than continually repeating, as many poor comedy films do. Rivalry begins with an afternoon love affair between Kirstie Alley and her brother-in-law. She doesn't know he is her husband's long lost brother. The film revolves around three "Sibling Rivalries": Alley and her sister, her husband and his sister, and the sheriff and his brother who becomes involved with Alley in a plot to dispose of a dead body. The plot may sound familiar but it is not quite what has been seen before. It is carried off with skill and perfect timing by a cast consisting of Ed O'Neill from "Married With Children," Scott Bakula from "Quantum Leap," Carrie Fisher and Kirstie Alley as the central focus. This is a good comedy and they are hard to find.