A Brief Rundown of Anthony Radziwill's Family Tree Anthony Radziwill was the son of socialite and interior designer, Caroline "Lee" Radziwill. Lee was the younger sister of Jacqueline Kennedy Onassis.

Lee Radziwill was known as First Lady Jacqueline ... In August of 1963, while Jackie was mourning the loss of her newborn son, she spent time on Onassis’ yacht. She married him years later ...