Isham Finch 1816 1876

Looking for my Great-Great-Grandfather's family back in Tennessee. I have found where they were in Texas at the time he died and that my Great-Grandmother, Emma Bell, was keeping house for her two brothers Icham and Finis. Emma bell married Warren Ridley and her brother Finis married Warren's sister Margaret Jane Ridley. Icham married shortly afterwards and I need to find his wife, Theodosia's parents and family.
The William H Ridley family and the Finch siblings were shown in the District 1, Denton County Texas 1880 Census to be practically neighbors since they are shown to be on the same page.