I just found this article. I really don't know a lot about the history of this claim.
My comment is that my parents are the ones who tryed to re-open or re-pursue this case in the early 1970's. They are long dead now. I was a teenager at the time they were working on it so I was not privy to the details.
My oldest brother, a decorated Vietnam Veteran told me the reason my parents dropped the lawsuit is that he noticed that our family was being watched and followed and felt the family had attracted the wrong kind of attention and was in danger. This is something he knew a lot about at the time because he was in that kind of business during the war.