I believe Martha is a daughter of Lewis Autrey and Elizabeth Autrey. She is never listed in a census with him by name, but she married Nathan before 1850 when listing names started; however, she matches the age of one of older girls listed on older census records of Lewis Autrey. Martha, Nathan, Lewis, and Elizabeth joined The Dove Baptist Church in Caldwell, Burleson County, Texas, the same day. I also have a copy of a letter of one of David Clanton's relatives saying Duard Autrey (my father's father) and he were third cousins. Duard's father was Jefferson Davis, his father was Miles Autrey, and Lewis was Miles' father. Contact me if you have further questions, I live in Caldwell, Burleson County, Texas.