Nancy Huff (Mary Steenburgen) and Dr. Robert Doback (Richard Jenkins) are getting married. Like most second marriages they are bringing baggage to the marriage. Unfortunately it comes in two over age adolescents. Brennan Huff (Will Ferrell) and Dale Doback (John C. Riley) are both close to 40 and cannot hold down jobs. Even worse they are to become step-brothers. At first they can't stand each other. They don't want each other playing with their toys and they definitely don't want to be sharing a room. This is what is taking place after their parents marry.
One day Derek (Adam Scott), Brennan's brother, comes for visit. He brings the family and his wife Alice starts to have an infatuation with Dale. You see one day Derek picks a fight with Dale and he punches him back. This one act will make Brennan and Dale rethink everything and become family. Alice is so turned on by the punch that she wants to molest Dale. Derek becomes the outcast.
Well life is about to change for the two men as their parents want to sell the house and go for a trip on Robert's boat. One problem, Brennan and Dale take the boat out and crash it. Thus keeping the parents land bound. Christmas comes and the family you think are going to settle down and enjoy the peace and love of each other.
Nope, the boy's have an episode and it brings chaos to all involved. The boy's were supposed to be finding other places to live by this time, and now it's mandatory. They must also find jobs to pay for their new digs.
In other words they are not able to this and if they don't they will be homeless.
Director Adam McKay brings us a movie that pokes fun at many subjects. You have the older age children still at home with their parents. You have the same two people not able to find jobs. You also get the lighter side of a dysfunctional family. All in all you get one messed up movie that no one is able to save. If you want to waste a couple of hours with comedy that makes you wonder why you are laughing then by all means go waste your time.