"We were all we had," Courtney Love says of her late husband Kurt Cobain

By Patrick Gomez
Updated March 12, 2015 05:55 PM
Credit: Kevin Mazur/WireImage

To the world, Kurt Cobain was the quintessential ’90s rocker, but to his wife, Courtney Love, and daughter, Frances Bean Cobain, he was so much more.

“We were all we had,” Love, 50, says in a trailer for the new documentary Kurt Cobain: Montage of Heck, which features home movies of Cobain, Love and their daughter.

The documentary is the first one to be supported by Frances – who has an executive producer credit on the film – and Love, who hand-picked director Brett Morgen for the project in 2008.

“I had done a movie called The Kid Stays in the Picture about Robert Evans,” Morgen told PEOPLE at the Sundance Film Festival in January. “Courtney had watched that movie daily for about three months and really loved my approach to nonfiction and thought I would be best suited to tell Kurt’s story.”

Morgen explained that Cobain’s family members are all “on the same page” about the film, which features interviews with those who knew Cobain from childhood as well as Cobain’s own personal audio recordings.

“This is what I’ve always wanted to do,” Cobain says of his music career in one of the recordings featured in the preview. “I’m really thankful for a lot of things.”

Cobain was particularly thankful for his wife and daughter.

“Aren’t we lucky,” he says in one of the home videos.

Kurt Cobain: Montage of Heck will air May 4 on HBO.