I am looking for my great great grandparents, William and Nancy Jackson. William J. Jackson was born about 1828 in Illinois and his wife, Nancy, was born about 1836 in Tennessee. They had a son named Thomas who was born approximately 1850 in Illinois, a daughter named Clarinda born 1852 in Texas and a son, Andrew Joseph Jackson, my great grandfather, born in Texas 17 Feb 1857. They can be found in Van Zandt County, Texas in the 1870 census and Nancy and Andrew are in Collin County, Texas in 1880. In the 1880 census, Nancy is listed as a widow. Any help would be appreciated.