No High school students to ride buses with middle and elementary school students

High school students are riding the bus with younger kids. Some of these high students are bullying the younger students. For example, a sixteen year young man that rides bus 82 was bullying several elementary kids. When these children tried to take a stand to him he told them, "this is not the end. You haven't seen the end of me." These children were scared to death. Two of these children are mine. They had not done a thing to this young man, yet, he was bossing them and making fun of them. Another incident on this same bus was a young girl who was throwing rock's and crayons at my daughter because she did not like where my daughter was sitting and wanted her to move. This is only a few things that have happen on the buses. Bus drivers have to go to the principal to have a student removed from the bus. High school students ride the bus at a different time in the afternoon, my goal is to get high school students riding the bus at different times in the morning and afternoon. This is not just to protect my children but other people's children who ride other buses. If bullying is illegal then lets keep it from happening.