RebYidd, gavra: As long as a child is living in the home of the parents. The parents are the boss. Why does the parent have to give up control over what the child reads before the child is an adult living on his or her own??
The least the parent ought to do, if the child refuses to listen, is forbid Assur reading material from entering their home. An uncooperative teen, can be asked to please find an apartment to live in if they can’t abide by the rules of the house. (After doing the math, most will opt to toe the line).
I am not talking about kids on the edge, I have no experience with that, and you would need specialized guidance in such a case.