I found this a short but interesting read in the New York Post Online:
October 29, 2004 -- CONSPIRACY theorists are buzzing about John Kerry's connection to Lee Harvey Oswald and the JFK assassination. While no one in the lunatic fringe has gone so far as to suggest Kerry helped kill Kennedy - yet - they make much of the fact that a cousin of Kerry's, Michael Paine, was a close friend of Oswald who frequently had the assassin as a house guest. Paine even stored the rifle Oswald used to shoot Kennedy at his house. Paine's mother, Ruth Forbes, and Kerry's mother, Rosemary Forbes, were cousins. It has never been fully explained how Oswald came to have such socially prominent pals, says A.J. Weberman, author of the JFK assassination book "Coup D'Etat in America," who notes that according to documents released under the JFK Documents Act, Paine's sister-in-law and father-in-law were both closely connected with the CIA.