1.  Jordan R. Dodd, ed.  1993.  Kentucky Marriages: Early to 1850.  Liahona Research, Orem, UT (Broderbund CD-229):

Keeling, Peter

Allender, Rachael

Feb 26, 1835

Todd Co.

Could "Rachael" be a misreading of "Ruth J"?  Everything points to this being the same couple that shows up in the 1850 Census.  I can find no later record of a second marriage for Peter.

2.  1840

3.  1850 Census Index/Microfilm (online at GenealogyLibrary.com):  District No. 1, Todd Co., KY, p. 196A, 1/1, enumerated 24 Jul 1850 (extracted by Diana Gale Matthiesen — record hard to read):

Peter Keeling	40	M	Farmer	200	Virginia
Ruth J	38	F			Ky
Mary J	15	F			"
Thos C	12	M			"
William M	10	M			"
Nancy	5	F			"
James D?	9/12	M			"

I tried to turn "Ruth J" into "Rachel," but couldn't, though it's easy to see how with a difficult record such a misreading could occur.  I'm wondering if the marriage record isn't a misreading of "Rachel" for "Ruth J"?  Living next door to Solomon & Nancy WOLF, who are living next door to Isaac & Dilly WOLF, who are living next door to Catherine (GRUMBLEY) KEELING, Peter's widowed sister-in-law.