It's not new info that Green Day's Billie Joe Armstrong has musically-inclined offspring. His eldest son, Joseph Armstrong, fronts the band Swimmers (formerly Emily's Army). They're pretty great, but we're calling it now: 16-year-old Jakob Danger Armstrong is the real talent in the family. His solo tunes are the thing of punk pop dreams, and "King of the World" feels especially resonant. And think about it, his middle name is literally Danger. Rockstar status or what?