I think it is a simple fix. They live in a group home that has restrictions on them sleeping together and living together. I am sure that when they moved in they had no problem with the restrictions and most likely even signed paperwork agreeing to the restrictions. If they don't like the restrictions, they should move out. Their parents want them to live together so bad even though they are incapable of living on their own, they should let them move in with them.
they should move in with the parents and might be more happyer if they did?