Dave Grohl has set the bar pretty high for epic shows ... playing with a broken leg, inviting fans on stage to jam, people getting MARRIED at his shows ... 

But this past weekend, at Notes and Words ( a benefit show for UCSF Benioff Children's Hospital) - the rock god took it down a notch but still gave a kick a$$ show - during his acoustic performance  - he brought his daughter Violet onstage with him - who nailed the vocals on a cover of Adele's When We Were Young ... Not enough - Grohl ended the set with a cover of his own Foo Fighters song, The Sky is A Neighborhood, with Violet on vocals and another daughter, Harper, on drums! Dude ... what are the Foos gonna do when they play Merriweather Post for the first time ever on July 6th ?!?