In 1972, I received a letter asking for a will or death record for:
Mark Castleberry, who died March 25, 1843.
Appears on the 1840 Forsyth County GA Census
Wife Keren Happuch Brodgon. Eight children.
Meredith, Mary, Elender, Keren, Elizabeth, Gatsy, Nancy, and William.
Also:
Odom Castleberry (Odin, Odean, Odum, and Odam)
Age 60-70 on the 1840 Forsyth County Census.

There is a will for Mark Castleberry, dated 10 May 1834 but entered in the will book in 1843. It mentions some of the children in the above list.
Witnessed by Odean Castleberry, Sarah Tallant and David Tallent. It is on the bottom half of page 254 and the top half of page 255 in Book A - Wills and Estates.

The will of Odean Castleberry made 31 Mar 1841 is on page 4 of the Ledger covering May Term 1844.
Executors: William Castleberry
B. W. Castleberry
Timothy Castleberry
Henry Tedder
David Putman

Heirs: wife Margaret in her widowhood
at her death or remarriage divided among my children to their satisfaction if not equally divided.
Children: Mark Castleberry
David Castleberry
Sarah Tedder
Liry Putman
John Castleberry
Odum Castleberry
William Castleberry
Benjamin W. Castleberry
Timothy Castleberry
Witnesses:
William Heath
David Tallent Jr.
David Tallent, Sr.
These records are in the Probate Court, Forsyth County Courthouse, Cumming GA 30040.

(Note: I think this Mark and Odom were brothers and that the Mark in Odom's will was his uncle's namesake.)
Mark's marriage to Karen is on file in Hall County, GA if memory serves.