Henry's Family Gallery
Joseph Henry (1797–1878) married his cousin Harriet Alexander (1808–1882) in 1820. They had four children: William A. Henry (1832–1862), Mary Henry (1834–1903), Helen Henry (1836–1912), and Caroline Henry (1839–1920). When the Smithsonian Institution Building, or Castle, was completed in 1855, the Henry family lived in apartments at the east end until Henry's death in 1878.