What must I do when I have taken all legal steps with transportation about bus driver closing my grandson up in the bus door?

It truly hard to give an answer to your inquiry because you haven't really told us any what instances you are referring. Was anyone injured? Harassment? etc.. If the driver is purposely injuring your grandchildren, contact an attorney to handle your situation. Good luck.

If he sustained injuries, a lawsuit best bet

While the driver should not be closing the door on your grandchildren, the first question is...were they injured???...if no injury, you probably do not have a case, but a lousy driver with lousy manners...consider making a written complaint to the school principal, board of education ( both the board and the superintendent personally)...also, in a small town, a complaint to the mayor and a letter to the local paper will draw attention to something they would rather avoid...assuming no injuries, bad PR may cause them to dismiss this bad driver.

With these limited facts, it would be virtually impossible to answer this question. I would suggest you contact an experienced personal injury attorney in your area. Many personal injury attorneys will give you a one-hour free consultation and will work on a contingency fee basis (taking a percentage of whatever settlement you obtain rather than charge you on a hourly basis). Good luck.