If I were the parents I'd send them to public school so I could get my kids back and then I'd take a holiday outside of Germany and never return.
I'd do anything I could to help them in that action.
There's abit more fishy then just the german authorities.
I believe in anything that involves ignorance in connection with german medical doctors or officials. Or let's make that officials.
But in this case a propper court was involved.
There must be more to this then just a family misunderstood and torn apart.