I thinkyouneed to look in AL for county with families named Quinn and Moss, looks like they may have come to TX from AL, together.
1870 census Washington Co, TX:
Quinn, James K., 25, b AL " Henretta, 25, b AL " Minnie, 3, b AL " Frank, 1, b AL " not named, 2/12, b TX
Quinn, Robert L., 29, b AL " Pernilla, 30, b AL " Willie N., 13, b AL Moss, Thomas, 34, b TN " Sarah, 20, b AL " Laura, 7, b AL
Look at ages of Thomas, Sarah & Laura, maybe Sarah is a second wife???Several families around these people are also born in AL, you might follow up on some of them, see what county in AL they are from, also.Or, maybe you know where Sarah's Quinn family was from in AL?