This is not my line of Fannings but believe all Fannons you listed in 1880 were descendents of Bryant (Abigail Muncy)Fanning, son of Achilles Fanning Jr of Wythe Co., VA.
T.L. was Thomas Landon (#1,Jane Burk Fletcher); Ellen(der) Thompson Fanning was the widow of Jesse R.(married 1839 Wythe Co., VA); Nancy was married to Crockett Thompson; and Boyd Miles was married to Lucinda Fanning.All were children of Bryant and Abigail.
As to the Reuben Fanning listed in the 1835 PP Taxlist, believe he is the same person who later went to north central MO in the very early 1840's.He is believed to be the son of John (Mary Davis) Fanning Jr, and his #1 wife was Martha "Patsy" Lineberry, his first cousin, of Grayson Co., VA.They are descendents of Chestnut Creek John Fanning Sr who died in early 1814 in Grayson Co., VA.This line is my line, but I descend from John Jr's brother Joseph Fanning who married Barbara Davis, Mary's sister.
Years ago I did research of Achilles Fanning Sr's line because at that time I thought my Fanning line of Orange/Guilford/Randolph Cos., NC and later Montgomery/Wythe/Grayson Cos., VA, was of the same line as Achilles Sr's. At this point in time, I do not believe the two lines are connected unless above Bryant Fanning Sr of Amelia Co., VA.
I have noticed your postings on Silas Fanning and even tried do a little reseach myself, but could not find anything.Hang in there, something eventually will surface that will be worth all your frustrations.Think you are possibly on the right tract as to Silas's father, but about all you can do is eliminate other Fanning families especially those that show up in KY at an early date in the meantime.Lots of luck.