Taft's federal judgeship was a lifetime appointment, and one from which promotion to the Supreme Court might come. Taft's older half-brother Charles, successful in business, supplemented Taft's government salary, allowing William and Nellie Taft and their family to live in comfort. Taft's duties involved hearing trials in the circuit, which included Ohio, Michigan, Kentucky, and Tennessee, and participating with Supreme Court Justice John Marshall Harlan, the circuit justice, and judges of the Sixth Circuit in hearing appeals. Taft spent these years, from 1892 to 1900, in personal and professional contentment.