From reading other posts there seems to be a misapprehension that being someone's next of kin carries legal rights. My understanding is that, unless you hold power of attorney or you are parent of a minor, this is not the case. "Next of kin" has no legal basis.
In fact "next of kin"is more often just a term used when emergency contact details are required - and isn't necessarily the closest relative.
We were informed about this by a specialist solicitor. I believe that once a person loses mental capacity their "next of kin" has no rights or responsibilities for them and Social Services has to be involved.
Having Financial power of attorney will give some rights to manage practical affairs but they do have constraints after the person loses mental capacity.
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). Anyone who hasn't already done it should perhaps think about doing it while they can, if only because it makes it easier for the family (or whoever you have chosen to be your attorney) when decisions have to be made for you.