Omar bin Laden, a younger son of Osama, left his father in Afghanistan in 1999 and later co-wrote a memoir with his mother, Najwa, a cousin whom Osama had married when he was seventeen and she was fifteen. In the book, Omar wrote that he had lost faith in his father as a young adult in war-ravaged Afghanistan when Osama suggested that he had his brothers consider taking up suicide bombing in the Taliban's cause. The boys demurred; Omar never got over the request. "My father," he wrote "hated his enemies more than he loved his sons."