In fact, it's not written in stone AT ALL.Some parents will talk to their df'd kids. Some witnesses may even have a very brief conversation with Df ones in the street if they happen to run into one. Especially, if they knew them quite well at one time.
I have seen both instances happen.
Again..Not always written in stone.
But you better stop before you cause one of Satan's Brigade of Spiritual Prostitutes and Whorshipers to engage in a little critical thinking and veer off-script.
On second thought, look at the person you're addressing; that one's head would explode.