David Livingston/Getty Billy Idol first learned a few years ago that he has an adult son named Brant Idol's daughter Bonnie found Brant through a DNA test The story is covered in the new documentaryBilly Idol Should Be Dead Billy Idolwas aproud dad to a son and a daughterfor most of his life — until he learned in his 60s that he was actually a dad of three. The punk rocker first introduced his fans to son Brant in 2023, when he joined the star at hisHollywood Walk of Fame star ceremony. In the new documentaryBilly Idol Should Be Dead, which premiered atTribeca Festivalon June 10, Idol's family reveals that Brant first came into their lives thanks to a DNA test. "I really enjoyed being a dad. I always wanted a boy and a girl, and I finagled my way into a boy and a girl. In your own daft way, you've achieved what you set out to do," Idol says in the film. "And I actually had a son that I didn't realize, who I fathered on the Rebel Yell tour without knowing it. So I somehow finagled this as well." Idol, 69, raised son Willem, 36, with exPerri Listerand daughter Bonnie, 35, with Linda Mathis. But when Bonnie became a mother herself, she decided she wanted to learn more about her family tree. Billy Idol/ Instagram "My husband just surprised me with a 23andMe, with a DNA test as a Christmas present," she says in the doc. "And then a few weeks later, I get the results back on the app and open it and I'm like, who is this? This Brant. And it says his info's like, New York, 1985, looking for my bio dad. I was like, 'What?'" Brant says in the documentary that he was raised thinking another man was his biological father. But when that man took a DNA test and the matches came up short, questions emerged. "I was like, 'Mom, is there a chance Mark might not be my biological father?' And she's like, 'Well, it's pretty crazy, but back in the day, we broke up and I actually spent a weekend with Billy Idol,'" Brant recalls. The "Dancing with Myself" singer was quick to welcome Brant into the fold. "Once I saw Brant with Bonnie and Willem, they've all got the same quirky sense of humor," he says. "And once I saw that, I could see he's my son, really." Brant adds that as he's gotten to know Idol better, he sees him as "a man who loves his family." "He's definitely showed me a lot of love, so I'm blessed,' he adds in the doc. With Brant now fully part of the brood, Idol hasembraced life as a grandfatherto Bonnie's daughters Poppy, 5, and MaryJane, 3, and Brant's kids Mackenzie, 4, and Mason, 2. The rocker frequently posts photos and videos with the children, and Brant and his wife even took their kids to an Idol concert in May, where they hung out backstage with the star. "It's a funny thing. We were at my sister's house, and [Idol's] laying on this bed and my daughter runs, jumps on this bed and then jumps right back off and lands on his private areas," Brant says. "And in my head I'm like, 'My daughter just crushed Billy Idol's nuts.' It's a funny story, but he loved 'em up. He loved my wife and my daughter. He's a good man." Billy Idol Should Be Deadis directed by Jonas Åkerlund. The doc features never-before-seen archival footage and intimate interviews with Idol and members of his inner circle, including his late mother Joan, longtime girlfriend Perri Lister and all three of his children. The film follows his rise to fame, becoming an MTV-era superstar, hisheroin addictions, his 1990near-fatal motorcycle accidentand more. Read the original article onPeople