I don't know of a William Matherly born 1842 in Sumner Co, TN. Levi Matherly had a son WILLIAM T. MATHERLY (b.1840 TN-d.Sept 10/Oct 28, 1863 Fort Delaware) He was in Co E, 7th TN Infantry during the Civil War. Captured at Gettysburg July 1, 1863. Died at Fort Delaware of disease. I don't know if he was ever married or not.
1st married on May 28, 1838 Sumner Co, TN to BETSEY MATTHEWS (b.____- d.before 1841).
2nd married on May 13, 1841 Sumner Co, TN to MARY McDUGAL (b.___-d.before 1851).
1850 Census Sumner Co, TN 53/524: Levi Matherly-36, John-12, William-10, Daniel-7, James-5. All born in TN.
3rd married on Oct 13, 1851 Sumner Co, TN to ELZIRA KEY LEVIAN (b.c.1822).
1860 Census Sumner Co, TN p.173/325: Levi Matherly-29, Alzira-38, William-20, James-13, Elizabeth-8, Frances-4, Manda-1. All born in TN. (Age recorded for Levi is apparently wrong since he had a son age 20).