Brennan Hough (will Farrell Will Ferrell), 39, is unemployed and has been eating at his mother's home, Nancy (Mary Steenburgen Mary Steenburgen). 40-year-old Dale Doc (John Riley John Reilly) is also an older man who lives with his father Robert (Richard Jenkins Richard Jenkins) and lives on his father's support. Nancy and Robert fell in love at first sight and moved into the Robert family after marriage. Brennan moved in with his mother and was forced to share a room with Dale as a stepbrother. The two gradually became the best partners from mutual hostility, and had a lot of fun with Brennan's excellent brother Derek (Adam Scott Adam Scott). Unexpectedly, their misdeeds ruined the happy marriage that their parents had just established. They regretted it so much that they finally decided to change their ways.