- Younger sister of Jacqueline Kennedy.
- Her son, Anthony Radziwill, 40, who was a TV executive with ABC's Primetime (1989), died on 10th August 1999, after a 10-year illness. He was John Kennedy Jr.'s best man at his wedding to Carolyn Bessette-Kennedy.
- Mother-in-law of Carole Radziwill.
- Aunt of Caroline Kennedy and John Kennedy Jr..
- Frequented the Paris Salon of Yves Saint-Laurent, along with her sister, Jacqueline Kennedy.
- Sister-in-law of the late U.S. President John F. Kennedy.
- Children: Prince Antoni Stanislaw Albrecht Radziwill, born 4 August 1959; and Princess Anna Cristina Radziwill, born 18 August 1960.
- Niece of Edith Bouvier Beale and cousin of Edith 'Little Edie' Bouvier Beale.
- While she attended Sarah Lawrence College, one of her classmates was Barbara Walters.
- Mother of Tina Radziwill and Anthony Radziwill.
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