Stop bringing it up is my advice, some things just can't be fixed, focus on improving your family's health and be a good role model to the younger crowd around you. Outside of that, there's really nothing more that needs to be brought to light, it's not even a question now of whether someone knows what to do or not, it's simply if that 'someone is willing to do what's necessary' or not, that's the preeminent issue.
Grab a coca-cola and enjoy the show... c00ns want to destroy themselves and their lineage I say good riddance.