I've heard Jeff fly the "F" bomb onstage and in Ashes of American Flags as well. I wouldn't my kids to hear that. Usually, if they label the show "kid friendly," he'll keep it tame. I just don't think a concert is a place for a five year-old. There are people drinking, smoking weed and cursing. No matter how tame Wilco is, you never know how the crowd will be.