The former First Lady was no stranger to tension between relatives.

And indeed, there was plenty of dirty laundry to air on the line.

Eventually, the rift between them became irreparable in the final years before Jackie’s death.

Jackie Kennedy and Lee Radziwill

She would say it outright, ‘Lee is my favorite’" (per Page Six).

Jackie Kennedy’ssecond husband, Aristotle Onassis, initially dated her sisterbefore they married in 1968.

Left: Janet, Jackie, and John Bouvier, Right: Lee and Janet Bouvier

Lee Radziwill and Jackie Kennedy