Do you have 1870 census of this family? Your grandfather was the son of "W. D." Yardley/Anna McDonald. W. D. was the son of W. C. Yardley. That contrasts the first posting! J. T. Yardley referenced in the obit was the brother of W. D. and uncle, possibly namesake, of your grandfather. Per census records (1880 TX-Robertson) he was born ca. 1863. I'm not related! FYI, W. C. Yardley wed Dovie Wilson 8 Feb 1866 in Coffee, TN. Dovie was previously married to Alexander F. Wilson, 20 Oct 1859, Coffee, TN.