I have found Georgia Fletcher post 30 May 2004 re "Notes Written by Isaac Sellers on April 1, 1912 on his Sellers family". In it he says that Lard Sellers (I assume Laird) was his mother's father. This is the same Isaac Sellers that wrote the 1922 letter to his nephew Frank. All the information matches between the two documents (although there is additional info in each of the letters) EXCEPT that he refers to his grandfather as Capt Samuel Sellers in the 1922 letter. Based on the relationships described, either Samuel or Lard would fit into the family tree at the same place. Could this be a middle name?