I have.  He was a systems analyst and was very skilled in performing
statistical analyses, and I considered even making up a big chart and
confronting him with a 'Cost-Benefit' comparison of seeing a neurologist vs.
not seeing one. Obviously. there *aren't* any benefits to not seeing the
neurologist (not even cost, because it would be covered entirely by his
insurance); I think the negatives to addressing this that he imagines is
that it means he will lose his autonomy, that he will be 'declared senile'
and be humiliated.  That's not true, really, but I don't think he's
listening to answers to his fears.

I have been documenting my observations since a few months after I started
noticing lapses in his memory. I brought these up last time I confronted
him, but his reaction is that his memory problem is the result of his not
getting his B-12 shots in a timely manner, and that he is 'going to give the
B-12 a chance to work.'  The problem is that he has given himself an
open-ended waiting period - any time I press him, he can say he wants to
give the B-12 a little more time.  I am particularly recording my
observations with relation to his B-12 shots now - e.g.., a week after his
shot, one evening he had to ask me how to set the cook time on the microwave
oven (he knew how to do it at breakfast, not at dinner). But even there, he
has insisted I am mis-interpreting things with some of his other health
problems, and I think he will just refuse to listen if it's just me saying
he has a problem. There aren't enough other people seeing him enough to have
lots of concrete examples of his problems, and the others in the family
agree they need to come and have some more direct contact, so they can
better give their separate evidence, confronting him about it. But that's
going to be a couple of months away at soonest.

--
Robert