Hi Ann,
How hard this must be for you and your sister trying to support your brother obviously for many years. I can read in your post how desperate you feel and was wondering whether you have heard of the Icarus Trust.
We are a charity that provides support for families and friends that are dealing with a loved one’s addictions. We have experienced trained volunteers who you might like to talk to as they have a good understanding of what you are going through. Talking with one of them might help you to feel less desperate.
You can contact us on help@icarustrust.org or visit the website http://www.icarustrust.org
I hope that you your sister and your mum can get some help and support for yourselves.