Well, according to BigRedV, the professionals who diagnosed my sister were incorrect.
So, the "diagnoses by professional" cr@p no longer flies with me. They could have diagnosed incorrectly. The judge would have seen this during the court proceedings. Everyone always natters on about what's best for the children. The judge decided this was. You can't have it both ways. Either the courts decide what's best for a child or they don't, so going to court for any children is pointless.
ETA: Yes, we are in the 20th century, with a higher understanding of people with special needs. Therefore, we should have an understanding that they need a higher and different level of care to other people.