I think that some of your info on your first generation (John A) is incorrect:
John A (Alfred?) Yearwood (1804-1877) married: 1)1824 Rutherford Co TN to Anney Pace 2)1838 Rutherford Co TN to Elizabeth Jamison I have seen it reported that he was a son of John Yearwood (1762-1847) who left a will in Rutherford Co TN.
The Aaron Yearwood who married Sarah "Sally" Webber moved to Illinois in the 1820's.He was a son of Frederick Yearwood & Jenny Haskins.
See my posting 340 for a list of all the Yearwood's that I could find in the 1850 census (including John A and Aaron).