Gaddafi son, grandsons killed in strikesASaif al-Arab Gaddafi, the youngest son of Muammar Gaddafi, was killed in a NATO airstrike on Gaddafi's compound in Tripoli on April 30, 2010.Saif al-Arab Gaddafi, the youngest son of embattled Libyan leader Muammar Gaddafi, and three of Gaddafi's grandsons have been killed in a NATO airstrike.