DISCIPLINE! 😫😰🔥⚠️

[~JBG~]

I mean there are other things too
- Taking away games/internet (aside from possibly schoolwork which would be supervised) for a portion of time
- If they get pocket money for being good, reducing or removing that for a week or other period of time

There's also the possibility of examining why the kids act out, finding the root of the problem and dealing with them in healthy ways. 
Therapy is a good choice. My grade school had a school therapist which is really neat. Parents should also be more open for the idea of getting their children visits to a therapist