"In the midst of all his troubles, the President delighted in his sons. The oldest, Robert, was away at Harvard, but Willie, 11, and eight-year-old Thomas, known as Tad, had the run of the White House. Willie was studious, liked to compose verse and memorize railroad timetables. He had raised a boys’ battalion from among his schoolmates and invaded Cabinet meetings with his "troops." In February, he developed what the doctor called bilious fever. His parents sat up night after night to nurse him. On February 20, Willie died. For three months, Mary Lincoln veered between loud weeping and silent depression and sought to communicate with her dead child through spiritualists."