@Bunniekins i know from experience that the best way to fight these kind of 'voices' is to love them to 'death'. i also know that the trouble with a lot of support people is that they freak when they hear mentally ill people experiencing ugly voices like this, however such does not help, but often makes the person hearing such voices go into hiding, which is FAR worse than them openly talking about what is going on tin their heads.
To try and deactivate, what i call 'evil' voices, and the intend such voices try and instil in those forced to hear them, is to love the person afflicted, even when are in 'the self influenced' by such voices.
i believe building a relationship of acceptance and let your love together direct his thoughts away from the bad thoughts into good thoughts instead is a very powerful way to oppose the bad things he is thinking and hearing.(It also helps finding what the triggers are that make such thoughts attractive to him.
)
i know this sounds easy, but i also know this is imposiible when the mental ill person is too sick to comprehend what is happening in their head. At such times just coming along as along supportive person, who loves them no matter what, making sure they get all the medications and supports the sick person needs, is then the best way to await them coming back to their senses.
To hold onto your loved one with all the love you got, even when they speak about wanting to do things that can make you shudder, is the best advise i can give you, and for your love to overcome such evil voices of evil intend trying to steal the mind of your son.
My prayers go out to you.🤗