I'm afraid I'm not knowledgeable enough, with regard to psychological conditions, to really advise you accurately regarding which forums, here on PC, would be appropriate to what is happening with your son. From what you wrote, it sounds as though he is struggling with delusions. And the particular forum that delusions fall under (according to the listing in the index) is the Schizophrenia and Psychosis forum. Here's a link:

https://forums.psychcentral.com/schi...nia-psychosis/

My recollection is that you may have already found, or been directed to, the Schizoaffective Disorder forum. However here's a link to that one too:

https://forums.psychcentral.com/schi...tive-disorder/

Also... here are links to articles, from PsychCentral's archives, on the subject of delusions:

https://psychcentral.com/disorders/d...rder-symptoms/

https://psychcentral.com/disorders/d...der-treatment/

https://blogs.psychcentral.com/careg...is-delusional/

https://blogs.psychcentral.com/careg...dium=popular17

https://blogs.psychcentral.com/careg...dium=popular17

https://blogs.psychcentral.com/careg...dium=popular17

https://blogs.psychcentral.com/careg...dium=popular17

https://blogs.psychcentral.com/careg...dium=popular17

My best wishes to you...