Ferrell notably sings "Por Ti Volaré" during the film's climactic scene while Reilly plays drums.

Robert and Nancy meet, fall in love, and marry, forcing Brennan and Dale to live together as stepbrothers.

Brennan had given up singing after Derek and his friends jeered his performance in a school musical, which also sparked their sibling rivalry.

They also sign Brennan and Dale up for therapy and open limited bank accounts for them until they find work.

The presentation backfires when the video shows the boat crashing, shattering Robert and Nancy's sailing dreams and straining their marriage.

Brennan gets a job at Derek's helicopter leasing firm and insists on overseeing a prestigious sales event, the Catalina Wine Mixer.

The party goes well until the lead singer of the hired Billy Joel cover band loses his temper with a heckler and is hustled away.

The pair take the stage and Brennan sings "Por Ti Volaré" while Dale accompanies him on drums.

As a Christmas surprise, Robert has turned his boat into a tree house stocked with props for Brennan and Dale to play with.

[3] For the home video release, Will Ferrell, John C. Reilly, and Adam McKay recorded a commentary track mostly in song, accompanied by Jon Brion; the track covers "the movie-making process [and] their characters' offscreen lives" in remarks that range "from the inspired to the irritatingly prolonged, but when Ferrell and Reilly really get into a good groove, they're actually funnier than the main feature".

The site's critical consensus reads, "Step Brothers indulges in a cheerfully relentless immaturity that will quickly turn off viewers unamused by Ferrell and Reilly -- and delight those who find their antics hilarious.

Step Brothers has a premise that might have produced a good time at the movies, but when I left, I felt a little unclean".

"[10] Variety critic John Anderson wrote, "the film is funny at times but lapses into the reflexive vulgarity that seems to be the default mechanism of the Apatow machinery.

Since the release of the film, "Boats 'N' Hoes" has contributed to the success of the movie with over a million hits on YouTube and merchandise that references the song.

The purpose of the PAC was never shared and was criticized by Lisa Paul, who served as the Texas Democratic Party Deputy Communications Director.

Then we have an idea for something happens that knocks him back to square one, and one of the brothers, John C. Reilly sort of instigates it, like 'we can't take this anymore.'

I mean the funny thing with Step Brothers is if those guys are in their 50s it still works, so we could easily return to that, but for now no sequels.

[24] In November 2020, Reilly said in an interview on Conan[25] of a sequel: Like a lot of artists, all three of us felt like 'Unless we were really sure we could make a better version or improve on what it is, let's leave it alone.'