Kid of billionaire Aristotle Onassis and step-mother Jackie Onassis, whose base is in charge of many philanthropic initiatives. He went to the Institut Le Rosey in Switzerland. After his untimely loss of life in an aircraft crash, The Alexander S. Onassis Base was founded in his name. His dad was Aristotle Onassis and his mom was Athina Livanos. He previously a sister called Christina. His dad wedded Jacqueline Kennedy Onassis in 1968.