It looks like Slipknot vocalist Corey Taylor and percussionist M. Shawn “Clown” Crahan’s sons Griffin Taylor (vocals) and Simon Crahan (drums) have a band together. You can see footage of them covering Slipknot‘s “The Devil In I” and “Dead Memories“ below:
https://www.youtube.com/watch?v=A7zheD8WvX4
Metal Anarchy 