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(Original Caption) John and Jackie Kennedy and their two children, Caroline and John Jr. (Photo by Brooks Kraft LLC/Sygma via Getty Images)

(Original Caption) John and Jackie Kennedy and their two children, Caroline and John Jr. (Photo by Brooks Kraft LLC/Sygma via Getty Images)

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Hyannis Port, Massachusetts, USA, September, 1960, The Kennedy Family gather for a group photograph at the family home in Hyannis port shortly after John F, Kennedy was elected to office of the President of the United States of America, Standing L-R: Mrs, Robert Kennedy, Stephen Smith and Mrs Smith a sister, John Kennedy, his brother Robert Kennedy, Mrs Peter Lawford- another sister, Mr Shriver, Mes, edward Kennedy and Mr, Lawford, Seated L-R: sister Mrs R, Sargent Shriver, his parents Mr and Mrs, Joseph Kennedy, his wife Jacqueline and brother Edward Kennedy (Photo by Popperfoto via Getty Images/Getty Images)

Hyannis Port, Massachusetts, USA, September, 1960, The Kennedy Family gather for a group photograph at the family home in Hyannis port shortly after John F, Kennedy was elected to office of the President of the United States of America, Standing L-R: Mrs, Robert Kennedy, Stephen Smith and Mrs Smith a sister, John Kennedy, his brother Robert Kennedy, Mrs Peter Lawford- another sister, Mr Shriver, Mes, edward Kennedy and Mr, Lawford, Seated L-R: sister Mrs R, Sargent Shriver, his parents Mr and Mrs, Joseph Kennedy, his wife Jacqueline and brother Edward Kennedy  (Photo by Popperfoto via Getty Images/Getty Images)

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14th April 1963: John Fitzgerald Kennedy (1917 - 1963), the 35th President of the United States, with his wife Jacqueline (1929 - 1994) and their children Caroline and John Jnr (1960 - 1999) on Easter Sunday at Palm Beach, Miami, Florida. (Photo by MPI/Getty Images)

14th April 1963:  John Fitzgerald Kennedy (1917 - 1963), the 35th President of the United States, with his wife Jacqueline (1929 - 1994) and their children Caroline and John Jnr (1960 - 1999) on Easter Sunday at Palm Beach, Miami, Florida.  (Photo by MPI/Getty Images)

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Outside the White House's Oval Office, American President John F. Kennedy (1917 - 1963) and his children, John (1960 - 1999) and Caroline, play with pony Macaroni, Washington DC, June 22, 1962. (Photo by Photoquest/Getty Images)

Outside the White House's Oval Office, American President John F. Kennedy (1917 - 1963) and his children, John (1960 - 1999) and Caroline, play with pony Macaroni, Washington DC, June 22, 1962. (Photo by Photoquest/Getty Images)

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A portrait of the Kennedy family as they sit in the shade of some trees, Hyannis, Massachussetts, 1930s. Seated from left, Robert Kennedy (1925 - 1968), Edward Kennedy, Joseph P Kennedy Sr (1888 - 1969), Eunice Kennedy, Rosemary Kennedy (1918 - 2005), and Kathleen Kennedy (1920 - 1948); standing from left, Joseph P Kennedy Jr (1915 - 1944), John F Kennedy (1917 - 1963), Rose Kennedy (1890 - 1995), Jean Kennedy, and Patricia Kennedy (1926 - 2006). (Photo by Bachrach/Getty Images)

A portrait of the Kennedy family as they sit in the shade of some trees, Hyannis, Massachussetts, 1930s. Seated from left, Robert Kennedy (1925 - 1968), Edward Kennedy, Joseph P Kennedy Sr (1888 - 1969), Eunice Kennedy, Rosemary Kennedy (1918 - 2005), and Kathleen Kennedy (1920 - 1948); standing from left, Joseph P Kennedy Jr (1915 - 1944), John F Kennedy (1917 - 1963), Rose Kennedy (1890 - 1995), Jean Kennedy, and Patricia Kennedy (1926 - 2006). (Photo by Bachrach/Getty Images)