What do I do to help my elderly neighbor that can no longer care for themselves/ each other?

The man is incontinent, blind, he has mobility issues and heart problems and many other issues. He seems to know that he is dying. His wife I think may have dementia. She has depression and heart problems and she is not taking care of her husband properly. They have no children that they can lean on and they have been taken advantage of by some gambling addicts that used to live down the road. They have stolen money from them and are very manipulating towards the elderly couple. They come over and dig though their things and try to isolate them from others who are trying to help the couple. The elderly couple are hoarders and they are not well off financially. I am very concerned about the wife not giving the husband his medicine on time leaving him home alone and not feeding him. I don’t want to get her in trouble because I love them like they are my grandpa and grandma but I just know that they need someone to care for them daily and I don’t know what to do. Please help.