Hi Alan,
Thanks for posting. I’m sorry that you’re feeling so helpless trying to deal with your son’s cannabis use and the impact it’s having on his brother and the family.
May be you would like to talk with someone who would understand and has a lot of experience of what you are going through. If so please contact us at The Icarus Trust. We are a charity that provides support to people who are affected by the addictive behaviours of a family member or friend. May be it would help you to find a way forward.
You can contact us on help@icarustrust.org or visit the website http://www.icarustrust.org
All the best.