Hi there, this sounds like a very difficult situation for you and I am sorry. I know of a great charity that supports people like yourselves nationwide. The family support programme is all remote and they help many families a year. Please see link and fill in the referral and someone will endeavour to respond within 24 hours. https://adaptoxford.org.uk/the-icarus-programme/
They also provide free treatment for those seeking help from addiction, however as as a family member wanting support I would deff get in touch with them.