Obviously, you've never dealt with a Kennedy. ;-) But OF COURSE they could sue -- if they were ALIVE. *Duh*. It's called slander.
Do you people also believe that recovered POW Jessica Lynch shot herself in the foot so she could be captured and raped by "one of those burly Republican Guard soldiers"?
The fact that you even ask that reveals 1) What a shill you are and 2) A certain sickness in the head. The answer is obvious. Although you can feel free to keep making yourself look stupid.
I see you ignored this question.
[BTW you don't need someone's permission to write a book or movie about them. Call up any bookstore tomorrow and they will fill you in. Anyway, I am willing to drop this part of the post in order for you to answer the first question.]