Hi there,Thanks for your enquiry.You apply to the Court of Protection to become your Mother's Deputy.
This is similar to you being your Father's attorney, but applies in circumstances where the person has or is losing mental capacity.
I am afraid it is quite a long process, and you can either apply personally or if you instruct a Solicitor to deal with it, you are looking at costs of approx £700- £1,000 plus VAT.
I attach a link to the Court of Protection website, which is where you would need to apply-
I hope this answers your question, and if so, I would be grateful if you could leave positive feedback.