Hi Em73
Welcome to the forum. Everyone here has a loved one with addictions. I understand that this must be a very stressful situation for you.
I was in similar situation with an elderly relative. She drank way more than I was aware, then was diagnosed with vascular dementia.
While she was mobile, she used to buy alcohol and hide it.
She needed a detox too. But because she had dementia and not proper in control of her own decisions, we got power of attorney (UK). She basically had to go along with what we said was best for her and we had the doctor and social worker on our side then.
I also contacted a local Carer Centre, who help the carers of vulnerable people. They told me where and who to seek help and support. They gave me times and places of various support centres.
I know it’s exhausting but please remember to look after yourself.
The Icarus trust posts here too, they could possibly help you.
Take care, let us know how you’re doing.
Lx