I was in a similar situation with tragic consequences. I found one very useful phrase to SS was that “My Mum is a vulnerable adult. My Stepfathers refusal to accept help is jeopardising her life”. They were also self funding, but SS have a responsibility to ensure your mum is safe.
My Stepfather refused help from every professional and it was only when he was hospitalised that I could get my mum away. A lovely Social Worker at the hospital told me what to say.
I am so sorry you are going through this. I know SS are overworked, but it should not take a crisis before your mum is helped. They cannot hide behind your Father, as their duty is towards your Mum,
Good Morning Saturday 16th May 2026

