Spanking. No kiddin. You don't need to put your children in a hospital. But a little slap in the buns never killed nobody, and as a last resort toll. can be really effective. Of course, go for ligth mesures before, and then scalate.
Take the things the kid like first, for a while, like no videogames fo a week, or two. If the nocive behavour dosen't go away, increase the time.
Take the things the kid like first, for a while, like no videogames fo a week, or two. If the nocive behavour dosen't go away, increase the time.