Hi
@BA66, As a 64 year old who has ben on insulin for 51 years I find your brother's plight very sad.
I wonder whether there is some brain trouble that your brother developed that lead to his diabetes being less well controlled or whether it was the other way around.
There are
publicised, routine tests for checking for causes of dementia-type conditions (nhs.uk Dementia Guide - Tests for Dementia.
If your brother is so unwell,
is he presently capable of consenting to treatment and make decisions about his health ? If he is deemed not to have capacity to be able to consent to treatment a
decision-maker, either one he has appointed in a previously filled out Advance Directive, Living Will etc, sometimes a family or patient representative or a government appointed Advocate. (Whatever the law is in UK.
Whoever
that person is, is supposed to be consulted and consent for treatment and decisions about your brother like nursing home placement AND
to keep the family informed of such decisions.
That person is supposed to act in the patient's best interests which includes finding out from family what the patient would be likely to decide about such things as being placed in a nursing home, seeking a second opinion regarding his health, brain-wise, diabetes-wise, if needed.
I am also concerned that
if your brother's diabetes is so poorly controlled in a hospital environment how likely is it that he is in any state to be at his best mentally to make decisions? One could perhaps be forgiven for wondering is he has somehow fallen in the 'too hard' basket,
a situation in which he finds all the support and advocacy possible.
I hope you can obtain some answers to the above queries and be able to insist on maximisation of his health. As others have said, there maybe diabetes treatment yet to try, current management maybe quite suboptimal but it is difficult to know without more precise information. The decision-maker (if there is one, or why isn't there one ?), consultants etc all need to be available in some way to help your brother's family, yourself best understand what is happening and what are the best steps forward.
My Best Wishes go with you.