Juanita, I didn't find the 2 people you were looking for in my books but I looked them up on Ancestry.com just to see if I could get anymore information. As you may know the Venables were in Lafayette co, MS. by 1850 but were in Tenn. before that. Judging from the census they were in Tenn. as early as 1837 and then in Miss. by 1845. Also, the birth date of their first child would put their marriage as early as 1836. I found them on the 1850 census Lafayette CO. MS, p. 316. and I found Rhoda as the head of household in 1860 in Paris, Lafayette, Miss., p. 86. I am assuming that Moses has died. The youngest child is 4 so that would put his death between 1856 and 1860. I do have a few Venables listed in my marriage book. I can look through to see what counties they in if you like. i am wondering if they were married in Tenn. Rhoda was born in Tenn. Have you tried looking there? Someone has listed the births of their children as happening in Henry Co., TN. Whether that's accurate or not, I don't know. But it's a place to start.
Sorry I wasn't more help. Good Luck in your search.