I'm not sure how helpful I can be because I don't have kids however I am an addict or an ex addict thanks to the grace of God. All I can really tell you is this. my family put me in several treatment centers, tried to push church at me and all it did was push me further away from them and closer to my addictions. Speaking from experience it divided my family and I very deeply.
however my mom and dad never quit praying for me even when I ended up in prison for almost 13 years they never quit praying, that is the most powerful tool or weapon that you have and asking others to pray for you and your son also, because now even though I'm 42 years old and I wasted a lot of my life, before I moved on from this life I found the grace of the cross. You and your son will be in my prayers.