Whatever is going on in the homes is the problem so it's kind of hard to undo all of that. You have to lay down your ground rules in your classroom & stick to it. Consistency is very important with children of this age - so if you threaten consequences of some sort, follow through. Be stern but loving - a lot of these kids do not experience love & attention at home & act out negatively in order to gain attention. Pray for God to give you the strength each day to be patient & loving. Pray for the kids & their families too. God knows they need it!