It's great that your daughter has the perseverance and persistance to keep fighting for her son. It's also wonderful that you're supporting your daughter. Your support enables your daughter to support her son - a chain reaction. I hope you and your family find the answers you're looking for.
My next door neighbor has a son with high functioning Autism. It's been wonderful watching him grow and be supported by his loving family. Last Semtember he moved to Montreal in Canada, on his own and is attending University. He was diagnosed at a very young age and this helped with getting the proper help in school. Best of luck to you and your family.