Barack's father, an economist, had split up with his white mother, Ann Dunham, from Kansas, when Barack was two. Apart from a month-long visit from his father when he was 10 years old, Obama would know him only through letters. As an adult he learned there was a darker side to his father, reflecting in his book that he had apparently also been "a bitter drunk", "an abusive husband", and "a defeated, lonely bureaucrat". But during this process of soul-searching he came to know and adore the elderly woman who had raised his father, his step-grandmother Sarah Obama.