About Christina Onassis
Christina Onassis (Greek: Χριστίνα Ωνάση; 11 December 1950 – 19 November 1988) was a Greek-Argentine businesswoman, socialite and heiress to the Onassis fortune. She was the only daughter of Aristotle Onassis and Athina Mary "Tina" Livanos. Onassis had an older brother, Alexander. Christina's parents divorced in 1960, precipitated by her father's affair with opera singer Maria Callas. Christina and Alexander reportedly distrusted Kennedy and never warmed to her.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.