It is rare for someone to be as open as me. As far as I'm concerned it is part of what makes me me, and I'm an open book. Literally lol https://www.amazon.com/ROAD-SOBRIETY-Personal-Experience/dp/B08N1KGNTK
But it sounds like you genuinely care and that is the best thing you can do for him. Care, LISTEN when he opens up, and do what you can to support him
My mom was there for me through my journey, still is. I'm 37 and my favorite tattoo I have is my mom tattoo. I actually got it when I was 35 :)