I agree that we are still our parent's children (that never changes) but we are not "children" anymore. But Moore's question in the film is dishonest.

It's like this: Your "child" breaks the law. He is sent before a judge in an "adult" court, and found guilty and then sent to "adult" prison.

Michael Moore takes to the streets in protest and complains "BBW's child is sitting in prison!" "Since when do we send our "children" to prison!!"
"Shame on America. Shame, Shame. Now we've sunk so low as to put our CHILDREN in prision!!!!"

Bystander: "But Michael, the kid's 35 years old.

Michael Moore: "He's still someone's child!!!"

Maybe he should have been sent to juvenile detention?