elderly abuse! thoughts on the subject?

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so the reason for this discussion is at the asking of my fiance. his great grandmother is sadly currently on her death bed and he feels that she would not be in such bad shape yet if she had been cared for better among other things. to start the story most of his family is really selfish and just generally bad people in a greedy wretch type of way. so his great grandfather was a contractor/owner of a fairly large construction company and therefor had a very large amount of money to stash away for his wife and descendants when he died and he put most of this money in accounts that were to be untouched till his wife or nanny from now on died as an inheritance. he also left several accounts for her to live off of for the rest of her natural life. the abuse part starts now. well these people that are her sons and daughters were taken care of very well when they were young but expected to go and find their own lives and money when they were of age and most of them did but a few just waited and when the time came when nanny was getting older and her husband had died from a heart attack. he was driving with nanny and her great grandson (my fiance) in the car because she raised him too after his mother had her own bad car crash when he was little. well after that day she had gotten a bad hit to the head in the crash and went blind in one eye and also began a decline in which she eventually stopped leaving the house for any reason. so one of her daughters came in to help take care of her. the problem is that not only was/ is she not taking good care of her she seems to have neglected her horribly over the years. there was a point a few months back that we came to the house to visit nanny and the daughter who ill call jane wouldn't let us in. a few weeks later when jane had a heart attack and was in the hospital for a week one of her sons and his wife came in to watch over nanny who was now completely blind from health problems and suffering from Alzheimer's. when this happened we were called to come over because they needed help cleaning up the house. we then found that everything was dirty including nanny who looked like she hadn't had a bath or shower in weeks at least and had long unclipped dirty nails. also there was all this new stuff in the house that was way beyond the budget (like a huge tv and a bunch of figurines and jewelry nothing essential) of the money left behind and jane didn't have a job she had falsified papers to become executor of the state and was siphoning money out of the accounts into her own! we were so angry and we called the man whom was the real executor and asked him if he knew about this and he didn't and also expressed his anger hes ex fbi and isn't in any way in need of money so thats why he became the trusted executor. so even though everyone was angry noone seems to be doing anything about this and of course nanny had gotten worse but atleast shes clean now. but jane is still her caretaker and the rest of the family is trying to keep us out of nannys house like were the bad ones but it seems like we are the only ones who care about her and not her money! i dont know what to do and this situation is distressing me very much does anyone have any thoughts? advice? i hope this story made sense its really longer but i tried to condense it.