Saif al-Islam Gaddafi rejected calls for his father to quit Libya as the price of peace with the rebels fighting to overthrow him.
"To tell my father to leave the country, it's a joke, he told the French TV channel TF1. "We will never surrender. We will fight. It's our country.
"We have to fight for our country and you are going to be legitimate targets for us."
Asked if he had a message for the French president, Nicolas Sarkozy, one of the prime movers in the Nato offensive, Gaddafi replied: "You are not going to win. You have no chance, zero chance, to win the war here.
"If you are angry with us because we are not buying the Rafale airplanes, you should talk with us," he added, a reference to the Dassault-built French warplane that Paris had been trying to sell to Tripoli before the uprising against Gaddafi.
"If you are angry with us because oil deals are not going well, you should talk to us. Rebels will not give you anything because they are not going to win." (read more)