Hi Davegarf,
Welcome to the Forum, a great place to share your story and be in contact with people in similar situations.
I am the Mum of an addict (alcohol and cocaine), although doing well at the moment.
Your Mum needs to stop giving him money, this is just enabling him to get what he wants, addicts are very manipulative people and do it very well. Hindsight is a very good thing, and if I could have the last 10+ years back, I would do it so different, my number one thing would be to not give them any money, they have to reach rock bottom, and then they might realise that they really need help.
There is lots of help out there, at the moment it is on line meetings, they don’t have to speak, but they can listen and realise that they are not alone in their addiction.
For families of addicts there is the Icarus Trust, where you can talk to people who are and probably have been in the same situation.
There is hope, but only if the addict really wants to be helped..
Keep in touch on here and never think that you are alone.
Take care
Dx