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  • Mrs. Lee Bouvier, center, and two daughters, Lee, left, and...

    Mrs. Lee Bouvier, center, and two daughters, Lee, left, and Jacqueline, right, walking down East Hampton and One Gracie Square, N.Y.C. in 1941. (AP-Photo)

  • Sen. John Kennedy, D-Mass., and his wife, Jacqueline Kennedy, watch...

    Sen. John Kennedy, D-Mass., and his wife, Jacqueline Kennedy, watch as her sister, Mrs. Lee Bouvier Canfield, holds their 15-day-old daughter during her christening in St. Patrick's Cathedral in New York City on Dec. 13, 1957. At left is the senator's brother, Robert Kennedy, acting as godfather. Third from left is Stephen Smith, the senator's brother-in-law. Boston's archbishop Richard Cushing christened the baby, named Caroline.. (AP Photo)

  • Socialite Lee Radziwill, sister of First Lady Jacqueline Kennedy, pictured...

    Socialite Lee Radziwill, sister of First Lady Jacqueline Kennedy, pictured swimming in the sea, Naples, circa 1960. (Photo by Keystone/Hulton Archive/Getty Images)

  • Portrait of American Princess Lee Radziwill, sister of Jaqueline Kennedy,...

    Portrait of American Princess Lee Radziwill, sister of Jaqueline Kennedy, sitting on a couch, 1960s (Photo by Express Newspapers/Getty Images).

  • US President John Fitzgerald Kennedy and his wife Jacqueline disembark...

    US President John Fitzgerald Kennedy and his wife Jacqueline disembark from the Air Force One jet liner on May 31,1961 at Paris Orly airport prior their official visit to France. (Photo credit should read -/AFP/Getty Images)

  • Prince Stanislav Radziwill, center, sees off his family at London...

    Prince Stanislav Radziwill, center, sees off his family at London Airport July 2, 1961, as they left for holiday in Switzerland. At left is his wife, Lee, a sister of Mrs. John F. Kennedy, the President's wife. Children are Anthony, 2, and Anna Christina, 10-months, held by a nanny, at right. (AP photo)

  • President John F. Kennedy and First Lady Jacqueline Kennedy ride...

    President John F. Kennedy and First Lady Jacqueline Kennedy ride in a parade March 27, 1963 in Washington, DC. (Photo by National Archive/Newsmakers)

  • Jackie Kennedy leaves the U.S. Capitol Building with her children...

    Jackie Kennedy leaves the U.S. Capitol Building with her children John and Caroline after attending a ceremony for her late husband John F. Kennedy November 24, 1963. (Photo by National Archive/Newsmakers)

  • Sisters and socialites Princess Lee Radziwill and Jacqueline Kennedy, sitting...

    Sisters and socialites Princess Lee Radziwill and Jacqueline Kennedy, sitting in the back of a car in London, May 15th 1965. (Photo by Central Press/Getty Images)

  • Actor Farley Granger and actress Lee Bouvier, better known as...

    Actor Farley Granger and actress Lee Bouvier, better known as Princess Lee Radziwill, Jackie Kennedyís sister, are pictured in a scene from the new David Susskin television production Laura, being filmed in London, on Oct 26, 1967. The production also stars Robert Stack and George Sanders, goes out on American television in December. (AP Photo)

  • Princess Lee Radziwill, sister of former US First Lady, Jacqueline...

    Princess Lee Radziwill, sister of former US First Lady, Jacqueline Kennedy at London Airport after the recent shooting of Senator Robert Kennedy on June 21, 1968. (Photo by Michael Stroud/Daily Express/Hulton Archive/Getty Images)

  • Lee Bouvier Radziwill Ross, left, the mother of Anthony Radziwill,...

    Lee Bouvier Radziwill Ross, left, the mother of Anthony Radziwill, arrives at the funeral of her son with his wife Carole Radziwill, at Most Holy Trinity Church in East Hampton, N.Y. Friday, Aug. 13, 1999. Radziwill, an award-winning television executive and best man at the wedding of his cousin John F. Kennedy, Jr., died Tuesday after a 10-year illness. Radziwill was 40. (AP Photo/Ed Betz)

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Martha Ross, Features writer for the Bay Area News Group is photographed for a Wordpress profile in Walnut Creek, Calif., on Thursday, July 28, 2016. (Anda Chu/Bay Area News Group)
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Jacqueline Kennedy and her younger sister Caroline “Lee” Radziwill grew up as close as sisters could be in luxury homes in East Hampton, Virginia, Rhode Island and New York.

As Jackie and Lee Bouvier, they shared a similar destiny: to become debutantes and future stars of American high society. But they also shared an early hardship: Their charismatic father pushed their mother to divorce him with his drinking and womanizing and by losing much of his fortune in the Wall Street Crash of 1929.

President John F. Kennedy and First Lady Jacqueline Kennedy attend the inaugural ball January 20, 1961. (Photo courtesy of Kennedy Library Archives/Newsmakers) 

Unfortunately, their father’s favoritism for Jacqueline also forged a path for the sisters’ relationship to one day be marred by jealousy and rivalry — and not just over society status. They also feuded over the two charismatic men Jackie Kennedy married: John F. Kennedy and Aristotle Onassis.

This “fierce competition” between the two sisters is described in a new book, “The Fabulous Bouvier Sisters: The Tragic and Glamorous Lives of Jackie and Lee.”

In the book, summarized by the Daily Mail, authors Sam Kashner and Nancy Schoenberger make the stunning allegation that Radziwill, now 85, had an affair with John Kennedy, which prompted Jackie to get revenge by later stealing Onassis away from her sister.

Radziwill had met the Greek shipping magnate first, according to the book. She had fallen in love with him and hoped to marry him, even though she was still tied to her second husband, the Polish emigre aristocrat Stas Radziwill, who gave her the title of princess.

Princess Lee Radziwill in London with her sister Jacqueline Kennedy-Onassis in 1970. (Photo by William Lovelace/Express/Getty Images) 

The book’s sources for Lee Radziwill’s supposed affair with John Kennedy, and Jackie Kennedy’s revenge, include Radziwill’s first husband Michael Canfield and conversations he had with Gore Vidal, the late writer who had been good friends with Kennedy, according to the Daily Mail.

“The relationship between the two was extremely close yet threaded with rivalry, jealousy and competition,” Kashner and Schoenberger write. “Yet it was probably the most important relationship of their lives.”

The authors describe how Jackie Kennedy kept an enemies list and told Vidal about it. Radziwill was on the list, and the list helps to explain why Kennedy didn’t leave anything to her sister in her will when she died of non-Hodgkin’s lymphoma in May of 1994.

According to Vidal, the omission in the will stemmed from the fact that “Lee had gone to bed with Jack.”

Canfield, a publishing executive who was married to Radziwill from 1953 to 1960, had also told Vidal: “There were times when … I think (Lee) went perhaps too far. Like going to bed with Jack in the room next to mine in the south of France and then … boasting about it.”

Radziwill’s alleged affair with John Kennedy took place before he became president and before her marriage to Stas Radziwill helped make her one of the leading ladies of international high society in the early 1960s, according to the Daily Mail’s report of the book.

But Radziwill was restless in her marriage to her Polish prince, Kashner and Schoenberger write in the book. She first had an affair with ballet legend Rudolf Nureyev and then she fell in love with Onassis, despite his own marriage and his longtime affair with opera singer Maria Callas.

But it turns out that Radziwill made the mistake of introducing her big sister to Onassis, first by having the shipping tycoon invite the U.S. first lady to spend some time with him on his Greek island of Scorpios, following the death of her son Patrick who was born prematurely in early 1963.

Jacqueline Kennedy and Aristotle Onassis following their wedding in Skorpios, Greece, Oct. 20, 1968. Caroline Kennedy can be seen at far left. (AP Photo) 

A friendship between Jackie Kennedy and Onassis developed, especially after the assassination of John Kennedy in November 1963. Nearly five years later, Jackie Kennedy returned to that Greek island to marry Onassis. It’s been reported that she may not have been in love with Onassis but she married him because he could provide privacy and security for her and her two young children, Caroline and John Jr.

For Radziwill, her sister’s marriage to Onassis was “a blow from which their relationship would never completely recover,” Kashner and Schoenberger write, according to the Daily Mail.

“What made it more painful was that it was Lee, of course, who had brought Jackie and Ari together,” the authors conclude.