Maria married Elnathan Wright on 04 July 1853 in Paris, Kenosha, Wisconsin. As you said she was the daughter of Phineas. He married Sophrona Houghton on 28 July 1829 in Lyndon, Caledonia, Vermont. He was the son of Ebenezer and Mary Hammond Cass. . They were married on 23 Feb 1800 in Richmond, NH. Mary died between 1804 when Phineas was born and 1806 when Ebenezer remarried. Ebenezer was born in 1780 in Cavendish, Vt and died in Burlington, Vt on 25 July 1813.
Phineas took is family to Wisconsin with his half brother, James Cass. James and his wife, Mary Ann Noyes were servants to Dr. White of the New England Emigrating Company. Phineas and his family did not stay to settle Beloit, Wisconsin as his brother did. He moved around Wisconsin working as a laborer. He died .04 November 1871 in Buffalo, Iowa