I think the family is the sell-out.. from what I saw on TV the Father/ Grandfather wanted to take this to his grave, he was ashamed. But he's had a stroke and since then the family has convinced him that he's some kind of hero and they got him to sell out before he died.. hence THEY make bank.
Sounds kind of childish now, Nixon passes him over for the FBI job, and he rats out Nixon, could see why he was ashamed of what he did.. maybe Nixon was smart enough to see him for what he really was, and that's why he didn't appoint him head of the FBI!?