I have 10 years of experience caring for 3 relatives and this is what I have learned . Apologies in advance as this might be long.
The very first thing is to make yourself a file that goes with you everywhere. I am a dinasour so mine was paper. You will be asked for the same information and and over again. Quite often in the same conversation and also at times when you are feeling stressed.
Writer their name, address, telephone numbers, DoB, place of birth, DoM and place of Marriage, NI number, GP details, list of medical conditions, list of prescriptions, dates of hospital admittance.
Every time you phone on their behalf, make a note. When you phoned, what time, who you spoke with, what they said. They record your conversations and when they deny knowledge, quoting dates and times works miracles.
I found that the Utility Companies were the very best at understanding the needs of dementia customers. Let them know you have PoA and they are very kind. British Gas have a system where they will phone just before an engineer arrives and give the name . Unlike Hospitals who have been known to phone a dementia patient with a message of a changed appointment.
Get their post redirected to you, if necessary. This prevents scams on their Bank accounts, allows you to see if they are paying for things no longer required. [ pet insurance for a pet dead 2 years and paying too much for other insurance products.) in my case. This is also invaluable in keeping track of hospital appontments.
LAs work under extreme pressure so try to be a friendly as possible. However, using the phrase, “This is a vulnerable adult and I am desperately worried” often helps. If in hospital, find out which Social Worker and OT are dealing with them. Again note down and try and get their telephone numbers.
AGE UK are the most helpful, sympathetic and knowledgeable people. They have calmed my tears on many occasions.
If possible try to get yourself onto at least one of their bank account as a joint holder. This saves many issues around PoA which should be easy but often is not. Try to get their accounts consolidated and keep meticulous records of all transactions.
Have a conversation with them about final wishes in hospital. Although not legally valid,my Mother and Stepfather wrote living Wills. Doctors involved in their end of life care were grateful for this insight. In both cases it prevented them going into the ICU.
Please contact me if you have any specific questions. I am not an expert, but can probably point to one. The very best most supportive people are those on the MNet ‘Caring for Elderly Parents’ thread, the combined knowledge and kindness plus the fact that they are facing the same issues was a life saver for me.