Your children need to be in therapy more than 2x/mo. They need to be in it weekly. You should look into something like Parent Management Training (PMTO). You need to support your sons, but you also need to set limits on their behavior so no one gets hurt. As they get older and bigger, this problem will be bigger if you don't get them the help they need now. Also, if you aren't in treatment, you should get your own treatment.