You have a serious and difficult situation. There are many legal issues that need to be addressed when considering suing a school district or individuals working in the district. There are lawyers in Columbia who handle these sorts of education related situations and family law issues, and you should contact someone immediately. AVVO lists 15 or 16 Education Lawyers in Columbia, and you might start by calling them I don't know any of them personally, however I do know Richard Rosen in Charleston also does some of that work and is excellent. I have worked with him many times over the years, and have always been impressed with his skill. You will find his contact information on avvo as well. Good luck with a difficult and frustrating situation.
This response does not create an attorney client relationship, and is for general information purposes only. You should promptly contact an attorney in your area to ascertain your legal rights.