The American ancestry of Timothy Ruggles Green reaches back to Thomas Green of Malden, Massachusetts, who came to America from Leicestershire, England, about 1636. His maternal grandfather, Timothy Ruggles, was a leading royalist in Massachusetts during the American Revolution. A cousin, Andrew Haswell Green, was influential in the planning and development of northern Manhattan and in the consolidation of Manhattan with its neighboring cities. Though his family remained centered in New England, principally Worcester, Massachusetts, Timothy R. became an attorney in New York City circa mid-1820s. He was a trustee of Brown University and was active in religious circles. He married Cornelia Elizabeth Arnold, a member of another leading New England family, circa mid-1830s. He had two children, the first being Arnold Green (1838 -- 1903), who went on to become a prominent attorney in Providence, Rhode Island. Timothy R. became ill in late 1839 and died on March 16, 1840, in South Carolina where he had gone in the hope of recovering.
John Wroughton Mitchell (1796 -- 1878) was born in Charleston, South Carolina. He began practicing law in that city in 1817. Mitchell married Caroline Green, the sister of Timothy R., in 1825. In 1835, Mitchell moved to New York City, where he continued his law practice, now in partnership with his brother-in-law. He was actively involved with the Episcopal church in Charleston and continued these activities in New York. The Mitchells had at least one child, Clarence, who also became an attorney in New York.
From the guide to the Green and Mitchell Papers, 1805-1861 (Bulk 1824-1855), (@ 2011 New-York Historical Society)