United States Congressman Theodore Sedgwick (1746-1813) and his first wife, Pamela Dwight (1752 or 1754-1807), had seven surviving children: Elizabeth Mason (1775-1827), Frances Pamela (1778-1842), Theodore (1780-1839), Henry Dwight (1785-1831), Robert (1787-1841), Catharine Maria (1789-1867), and Charles (1791-1856). Henry Dwight Sedgwick, who married Jane Minot (b. 1795), graduated from Williams College in 1804 and became a lawyer in New York City. Catharine Maria Sedgwick, along with her sister-in-law Elizabeth, the wife of Charles Sedgwick, ran the Lenox Academy, a women's school in Lenox, Massachusetts; she became a successful novelist with publications such as A New-England Tale (1822) and Hope Leslie (1827).
Robert Sedgwick married Elizabeth Dana Ellery (1799-1862), a granddaughter of Declaration of Independence signer William Ellery, on August 21, 1822. Their surviving children included Elizabeth Ellery (1824-1909), William Ellery (1825-1873), and Susan Ridley (1828-1883). William Ellery Sedgwick graduated from Harvard in 1846 and became a lawyer in New York City. Susan Ridley Sedgwick married New York City lawyer Charles E. Butler on October 1, 1855.
Around 1860, Elizabeth Ellery Sedgwick ("Lizzie") married Boston native Francis James Child ("Frank") (1825-1896), who was appointed chair of English literature at Harvard in 1876. They had four children: Helen Maria Castilia (b. 1863), Susan Sedgwick (b. 1866), Henrietta Ellery (b. 1867), and Francis Sedgwick (1868 or 1869-1935).
Helen Maria Castilia Child married Frederick LeRoy Sargent, and Francis Sedgwick Child married Caroline Stanger.
From the guide to the Elizabeth Sedgwick Child family collection, Child, Elizabeth Sedgwick family collection, 1826-1918, 1826-1837, 1855-1885, (William L. Clements Library, University of Michigan)
