Welcome to Psych Central, LRoseB. And thank you for bringing your concern here to PC. One additional forum, here on PC, you might like to check out would include the Partners of People & Caregivers forum. Here's a link:

https://psychcentralforums.com/partn...ivers-support/

You've already received several great replies from other PC members. I doubt there would be much I could add to what you have already received. However here are links to 15 articles, from Psych Central's archives, that address various aspects of the situation you describe. Most of these will probably be of as much or perhaps more help to your son than they are to you. However (hopefully) they will provide you with some ideas on how to proceed as well:

Posttraumatic Stress Disorder (PTSD) | Psych Central

Understanding PTSD and its Effects on Marriage

You, Me and PTSD: Relationships with Partners Who Have Suffered Trauma | Partners in Wellness

How Does PTSD Affect Relationships?

https://psychcentral.com/lib/ptsd-and-relationships/2/

https://psychcentral.com/lib/the-uni...-complex-ptsd/

https://psychcentral.com/lib/c-ptsd-...dium=popular17

https://psychcentral.com/lib/15-ways...illness/?all=1

https://psychcentral.com/lib/how-to-...sed-loved-one/

https://psychcentral.com/blog/5-tips...ental-illness/

https://psychcentral.com/lib/when-me...s-for-couples/

https://psychcentral.com/lib/how-to-...sorder-part-1/

https://psychcentral.com/lib/how-to-...dium=popular17

https://blogs.psychcentral.com/weigh...e-a-caregiver/

https://psychcentral.com/blog/how-to...essional-help/

My best wishes to you & your family.