Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
Have you identified a possible home?
Does anyone hold Power of Attorney for your mother's welfare?
Have you actually checked here
Does she hold power of attorney
Actually "next of kin" simply means nearest blood relative - so all her children count equally there.
Is the Attorney for Financial matters only?
How often are you able to visit your mother?
And have you spoken to her doctor?
How many siblings do you have?
Are the others (apart from the carer) as concerned as you are?
Do your siblings also visit?
Have you tried to arrange a meeting with the sister who is the carer?
When was your father's funeral?
I do understand how difficult what I am about to say is.
This is a matter where you need to bide your time a little.
It is still very early days and as you have discovered Social Workers are predisposed to giving your sister the benefit of the doubt.
Instead you need to arrange a timetable of visits so that some one sees your mother every other day or so to keep an eye on her.
Do not comment on the circumstances in the house - but do discreetly photograph and relevant problems and keep a careful diary.
Assuming there is no dangerous deterioration in the mean time arrange a meeting with Social Service sin two months time and then review the diary with them and ask them to arrange the meeting that they promised and then reneged on.
I know that this is not what you wish to hear - but it is a realistic assessment of what might actually eventually achieve the result that you need
please ask if you need further details