Jacqueline Kennedy Onassis followed her everywhere and nicknamed her "Jackie O". During their marriage, the couple inhabited six different residences: her 15-room Fifth Avenue apartment in Manhattan, her horse farm in New Jersey, his Avenue Foch apartment in Paris, his private island Skorpios, his house in Athens, and his yacht "Christina O". Kennedy ensured that her children continued a connection with the Kennedy family by having Ted Kennedy visit them often. She developed a close relationship with Ted, and from then on he was involved in her public appearances. Aristotle Onassis' health deteriorated rapidly following the death of his son Alexander in a
Aristotle Onassis was 17 at the time of their marriage; Onassis was 40. Onassis and Livanos had two children, both born in New York City: a son, Alexander (1948–1973), and a daughter Christina (1950–1988). Onassis named his legendary super-yacht after his daughter. To Onassis his marriage to Athina was more than the fulfillment of his ambitions. He also felt that the marriage dealt a blow to his father-in-law and the old-money Greek traditionalists who held Onassis in very low esteem. The couple had become largely separated by the mid-1950s, with the end of the marriage coming after Livanos found Onassis in bed