Within a 29-month period, Christina lost her entire immediate family. Her brother, Alexander, died in a plane crash in Athens in 1973 at the age of 24, which devastated the family. Her mother died of a suspected drug overdose in 1974, leaving Christina her $77 million estate. Following Alexander's death, her father's health began to deteriorate, and he died in March 1975. After losing her father, Christina renounced her U.S. citizenship and donated the American portion of her holdings in her father's company to the American Hospital of Paris (she held dual citizenship in Greece and Argentina throughout her life).