If you are in a violent or abusive relationship at home, then its best to break free.  Family should be sanctuary not a violent environment.  If your home is violent then the cycle will continue when you go outside of the home because you carry emotional baggages from there.

Education.

If everybody is educated and know what to do and how to avoid it, then violence will have no place in school or at home.  If people listen instead of just talk all the time, then there is no need for fists when reasoning will suffice.

Our teens must be guided in participating any sports activities. In so doing these their attention can be diverted in making them mentally, physically and emotionally healthy added by spiritual acts(before starting the game there must have a prayer). 

There must have a bond for the whole family, like the saying "the family that prays together stays together".The whole family members must be encouraged to be on time in praying, with this, all should be one.

when someone says something insensitive to you, confront him or her in a nice way and avoid starting a fight. hope this helps.

i suggest a very strong policy for those children in school to be discipline.  Have a good home and family life for the