@TheGreatestStar I do not know the answers to those questions, these are my thoughts but perhaps asking a health professional might be useful.
Not sure if reading an article at this point would be helpful for your husband, would he be amenable to addressing any stress he may be feeling without personal mention of his delusions (that is a known cause of psychosis.) Challenging the psychotic thoughts is like arguing with someone who has dementia.
With regard to your son, you know his maturity levels but some explanation would likely be helpful.
My husband had some delusions (quite different to what you are experiencing), he no longer experiences these but there are residual symptoms. He is on a DSP which helped us financially, not a great lot of $$ due to my income initially but discounts really helpful.
