Courtney posted on Twitter accusation's that Dave Grohl, Kurt Cobain's former Nirvana bandmate, was hitting on their 19-year old daughter. Now Francis Bean herself has stepped in. "While I'm generally silent on the affairs of my biological mother, her recent tirade has taken a gross turn. I have never been approached by Dave Grohl in more than a platonic way….I'm in a monogamous relationship and very happy. Twitter should ban my mother.