I really do wish you well in looking after your relative and his affairs.
My sister and I are now dealing with my mother's estate since she died 3 months ago. 15 years earlier, we recognised the need to make sure that her and my late father's affairs were properly organised and, although they already had Wills, they, with our help, approached solicitors to draw up Powers of Attorney. Yes, it cost money at the time but, although we did not need to invoke the POA in either case, we still regard it as a sound investment. At the same time as my parents, we had similar documents drawn up for ourselves, even though we were still only in our 50's. We now have that peace of mind knowing that proper decisions will be made should we become similarly incapacitated and that our attorneys should not be constrained from acting in our best interests nor become embroiled in having to seek further judicial approval and all that entails, as alluded to by Atlanta, to manage our affairs and arrange for the care we might need and deserve.
We always recommend to everyone we speak to that, if they haven't already, they should review their position sooner rather than later and to put their affairs in order without delay so as to avoid being confronted with situations similar to the one you appear to be faced with.