I just found some more clues while digging through the Williamson County records.Does this marriage match up with what you're tracking?
"A.J. Kellow to Martha Sledge 1/25/1872"
If so, there's even another entry or two about Martha Sledge in the new message I put up today on the board.What I found last night makes me think that Arthur Kellow was not a son of Thomas Sr. (and therefore not a brother to my 3rd great grandfather Thomas H. Kellow).He is not in the older Thomas' Will.Thomas does mention sons Thomas, William, Presslie, and Hezekiah.These may be the only living ones in 1834.Hezekiah and William were a bit older than Thomas H., and they were born in the 1790's.If this (or your) "A.J." was Arthur's son, I think Arthur was either the son of William or Hezekiah Kellow.William was married to a Frances Newby (or Nuby).