I am very sorry this accident occurred, and I hope that all the children's injuries were in fact minor. I hope they recover quickly. I am also very glad no one was more seriously hurt.
Many people do not realize that children are covered by their parents' car insurance. Normally, as long as a child resides with at least one insured parent or guardian, that child can submit a claim for Michigan No Fault insurance benefits to the insured parent's insurance company. No Fault insurance will pay all reasonable and necessary medical expenses caused by the accident regardless of who caused the accident or how it occurred. In addition, a child who is severely injured in a bus accident might be able to sue the bus driver or school, but thankfully that does not appear to be necessary here.