In the link you reference, is one of the things that kept coming back to my mind. It is that his family believed he was a con man and left him. I know sometimes people can get the wrong ideas, but a family usually knows a person best. I say usually, because people can be wrong of course, but I don't think so in this case. It is a sad story.
That part of the book was particularly poignant for me as well. But history is full of heroes whose families abandoned them. Some stand among the greatest inventors of all time.