Dave Grohl and his mother Virginia Grohl stopped by The Late Show with Stephen Colbert to promote her new book From Cradle To Stage: Stories From The Mothers Who Rocked And Raised Rock Stars.

Not only did they promote the book, but Grohl’s mom brought one of Dave’s past student report cards to talk about and they discussed Kurt Cobain’s death and how it affected their relationship.

You can watch the interview below.