Jeddah, SAUDI ARABIA: On the corner couch of a spacious room, a woman wearing a brightly patterned robe sits expectantly. The red hijab that covers her hair is reflected in a glass-fronted cabinet; inside, a framed photograph of her firstborn son takes pride of place between family heirlooms and valuables. A smiling, bearded figure wearing a military jacket, he features in photographs around the room: propped against the wall at her feet, resting on a mantlepiece. A supper of Saudi meze and a lemon cheesecake has been spread out on a large wooden dining table. Alia Ghanem is Osama bin Laden’s mother, and she commands the attention of everyone in the room. On chairs nearby sit two of her surviving sons, Ahmad and Hassan, and her second husband, Mohammed al-Attas, the man who raised all three brothers. Everyone in the family has their own story to tell about the man linked to the rise of global terrorism; but it is Ghanem who holds court today, describing a man who is, to he...