This is my Mathis family in the Denver, Carroll Co, AR area.The dates are quite a bit earlier than what you have, but maybe you can make some connections.
James Mathis (have also found names as Lemuel Mathis) m. Sally Jones [first name is probably Sarah - also have found name as Elizabeth (Hannah)] b. TN d. Denver, Carroll Co, AR bur. probably Denver Cem, Caroll Co, AR
Their daughter was my ggg-grandmother, Nancy Caroline Mathis Erwin (b. 1826).I don't have any siblings for her, but that doesn't mean that she had none.