Fredric Saunders has done research on the Allison family and has posted results.
Fredric Saunders has provided detailed information on John, who was his ancestor.
Ancestry.com [database on-line]. Tennessee State Marriages, 1780-2002
Original data: Tennessee State Marriages, 1780-2002. Nashville, TN, USA: Tennessee State Library and Archives
Of the children, grandchildren, etc. of John Moody and Cassander Allison, I will address only one child for whom I found records Mr Saunders didn't have while I was doing research in the Henry Co., TN, archives and records: William Mc. (probably McCuiston) Moody. Although I suspected strongly that there was a relationship to my Moodys, I could not identify William Mc before discovering the results of Fredric Saunders's research. For a more thorough discussion of the John Moody branch, refer to Mr. Saunders's data on John's family.