A show of brotherly love will open the Tribeca Film Festival next month.

"Mistaken for Strangers," filmmaker Tom Berninger's documentary -- made while he was working as a roadie for his older bro Matt's band, The National -- will open the festival on April 17. After the film, the Brooklyn-based band will perform a special show.

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"What started as a pretty modest tour documentary has, over the last two and a half years, grown into something much more personal, and hopefully more entertaining," said Tom, a heavy metal and horror movie aficionado, in a statement. To which indie-rock dude Matt countered: "I was happy to give my brother whatever access he needed. I just didn't expect this movie to include shower scenes."

As you might expect, the film is billed as a "hilarious and touching look at two very different brothers and an entertaining story of artistic aspiration."

The title of the documentary comes from a track on the group's 2007 album, "Boxer." The making of "Boxer" was documented in another film, 2008's "A Skin, a Night."

Check back at TriBeCa film.com for updates.