Wow, EP. Thank you for sharing this. My heart goes out to you and your family. I think it is important for this to be written down and spoken about in public so people can see the destructiveness of these kinds of groups.
I am hoping your son will be ok. If it were me, I would be formulating my strategy on the best way to start freeing his mind. Mad Sweeney was able to free his family. Black Sheep has good advice too (ask questions that when answered truthfully specifically point out fallacies of the doctrines).
Always, always maintain with him that you will love him no matter what his choices are in life. This may be key for the future. Always be there for him no matter what.
So now, when he showed up for his time with me this weekend, he had a daily text book, a new bible, song book and magazines and asked me if I was taking him Sunday or dropping him off at his mom's house and then going.
Maybe this is the perfect time to start your own personally created Family Bible Studies with him. This may take some time to organize and create but tell him that you and he are going to do some Bible studies of your own. Make it fun for him. Use the Bible to show him their fallacies but get him to look it up. Get your son to answer your questions. Make him do his research and think. Share with him what you have discovered. I am not sure how old he is and how much he is able to do or comprehend. Perhaps leverage some of his interests by incorporating them into this as well. Another idea would be to start doing some community work to help others (as Christ taught) and incorporate that into the 'study' time as well. An example would be to help out at a local shelter or go grocery shopping with him for food for your local food bank and then the 2 of you personally deliver it. Go and help out at the food bank. Makes this a fun thing for him. Then do something he enjoys afterwards. Actually participating in helping others will show him a different side than what the JWs teach and do. JWs do useless things. Christ taught to feed the starving and heal the sick; to help those less fortunate. As a kid this was one of many things that bothered me about JWs because they are 'do nothing' people . A magazine is useless if someone is starving.
Some questions/statements I have asked my parents over the years were: Please show me the scripture(s) in the Bible where God says, specifically, that going to the Kingdom Hall and handing out Watchtower and Awake! magazines will ensure my eternal life.
Is God directing the Watchtower? Please show me the scripture that states this.
Show me the scripture that specifically states Jehovah's Witnesses were Chosen by Christ. ( Maybe leave this one for when he is starting to wake up and ready to research this.)
As part of all this, maybe start a series of educational sessions with him about the history of the Bible, how it was compiled, and by whom. No one as a JW is taught this stuff.