Thank you for all the replies.
Mum is currently living at home with husband and brother.
I rang social services on behalf of my brother to find out what was happening and it was then I found out about the need for a court decision, but the social worked had not done before and did not know how long things would take.
The court, I guess, is court of protection; I have found this
https://www.gov.uk/oneoff-decision-personal-welfare/overview which gives an overview of process but not timing.
The social worker attended the family home as part of an investigation - I do not have details of what or by whom; my fathers shouting at my mother can easily be heard in the street, and they have admitted tipping water on my Mum to shut her up on more than one occasion.
My brother (who has health issues and disability) is thoroughly stressed by the pair of them.
There is an old style enduring power of attorney but as far as I know it is not registered.
Mum has been judged by the social worker as having capacity to choose when she wants to live.
If I understood correctly Mum has also been assessed by the social worker as lacking the capacity to understand the stress that her behaviour (dementia/anxiety/bipolar) is having on my brother and father.
The best interests view of the social worker and the people she consulted with is that Mum is moved into care.
Hence it is going to court for a decision on whether Mum can be moved into care.
I am trying to get a sense of how long this might take as we would need to look into care homes within social services budget - social services have already kicked off process of looking what NHS might fund under CHC.
I have since emailed the court of protection to find out how long it might take - if I get a helpful response I will post details here.
Kind regards
Jackie