BOSTON -- A trove of Kennedy family paraphernalia, including a letter in which former first lady Jacqueline Kennedy appears to counsel her sister-in-law about marital troubles, will be auctioned off in Connecticut this weekend.

The letters, along with a life preserver from President John F. Kennedy's sailboat and other items, were found in a storage unit on the Cape Cod summer resort area of Massachusetts, where the Kennedys still maintain a family home.

"Be a bit mysterious," reads one of the letters in which Jacqueline Kennedy appears to advise Joan Kennedy on how to handle her marriage to U.S. Sen. Edward Kennedy, a Massachusetts Democrat.