I ain't a psychology doctor but this kind of problem are need to be treated well because the mere fact that the involve with gambling addiction if minor or even if not should need a cure.
Yeah right, most gambling addicted persons are prone of doing things unusual, especially those minors there's a need of special treatments to make them recover and start living a normal life.
And yeah giving him/her a new environment where he/she could live another way of lifestyle is better for him/her to forget the addiction hw/she had undergo in his/her life.
The very bet way to counter this addiction, moving him away from the place where he got that addiction and start providing new activies to change up his mindset and keep him busy to other things.
But of course before he/she bring in another environment we'll just need to make sure that he/she had undergo medication if needed or been in pschology doctor to treat his/her addiction.
It's important to know everything and hear what professional will advise for a much faster recoveries.