Don’t tell your kids what they can or can’t do with their own time: If they have earned recreational time, they get to do whatever they please, even watching TV or playing on the computer, if that’s what they want to do. Otherwise, there is no incentive for them to earn recreational time.
These individuals taught me the most important rule of the writing game: to be a writer, you must write. Of course one may dream or ponder, but such actions are preparation. Dreaming is not writing. Pondering is not writing. Putting thoughts down on paper is writing. The only way to be a writer is to write. There is no other way.