FILE - Sen. Edward Kennedy, from left, first lady Hillary Rodham Clinton, President Bill Clinton and Ethel Kennedy, right, listen to a remembrance delivered by Rep. Joseph P. Kennedy II during a memorial Mass in honor of Robert F. Kennedy on the 25th anniversary of his death at the Arlington National Cemetery in Arlington, Va., June 7, 1993. (AP Photo/Marcy Nighswander, File)

FILE - Ethel Kennedy holds her new son, Douglas Harriman Kennedy, with two-year-old Christopher Kennedy, right, as they leave Georgetown University in Washington, April 13, 1967, for home. (AP Photo/Henry Burroughs, File)

FILE - Sen. Edward Kennedy, back, stands behind the widow of former Senator Robert F. Kennedy, Mrs. Ethel Kennedy, second left, with her five children, and his wife Joan, right, as they pause at the grave of assassinated President John F. Kennedy in Arlington National Cemetery, Nov. 20, 1970, in Arlington, Va. (AP Photo/Bob Daugherty, File)

FILE - Egyptian human rights attorney and women's rights activist Ragia Omran, center, gets a kiss on the cheek from Robert F. Kennedy Center President Kerry Kennedy, right, accompanied by Ethel Kennedy, left, during the presentation of the RFK Human Rights Award, Nov. 21, 2013, on Capitol Hill in Washington. (AP Photo/Susan Walsh, File)

FILE - U.S. Rep. John Lewis, D-Ga., center, talks with those gathered, including Ethel Kennedy, center, and Rev. Jesse Jackson, on the historic Edmund Pettus Bridge during the 19th annual reenactment of the "Bloody Sunday" Selma to Montgomery civil rights march across the bridge in Selma, Ala., Sunday, March 4, 2012, 47 years after the historic march that led to the Voting Rights Act. (AP Photo/Kevin Glackmeyer, File)

FILE - Ethel Kennedy holds hands with grandson Joseph P. Kennedy III, left, while Navy Secretary Ray Mabus chats with her daughter Kathleen Kennedy Townsend, as they pose near a rendering of the Robert F. Kennedy Navy Ship named at the John F. Kennedy Presidential Library, Tuesday, Sept. 20, 2016, in Boston. (AP Photo/Elise Amendola, File)

FILE - Attorney General Robert F. Kennedy, right, wife Ethel Kennedy, and children, from left, Bobby, Joseph, and Kathleen, second right, pose at Kennedy International Airport in New York, July 1, 1964, shortly after they returned from a one-week trip to West Germany and Poland. (AP Photo/Matty Zimmerman, File)

FILE - Ethel Kennedy, from the film "Ethel," poses for a portrait during the 2012 Sundance Film Festival on Sunday, Jan. 22, 2012, in Park City, Utah. (AP Photo/Victoria Will, File)