— born in Knox Co., OH:
5.  Martin C. HORN, b. 9 Apr 1823
6.  Solomon HORN, b. 1828/9
7.  Joseph HORN, b. 1830/1

1.  Family Quest Archives:  Ohio Federal Census 1850: Knox County.  Heritage Quest CD M432-700:  Harrison Twp., Knox Co., OH, p. 401A, 2485/2545, enumerated 25 Sep 1850 (extracted by Diana Gale Matthiesen):

Joseph Horn	65	M	Farmer	6500	Penn
Susannah "	65	F			do
Soloman  "	21	M	do		Ohio
Joseph   "	19	M	do		do
Martin Horn	27	M	do		do
Elizabeth "	24	F			do
Elizabeth Ullery	30	F			Penn
Kasiah J    "	9	F			Ohio

Elizabeth HORN must be Martin's wife.  Elizabeth ULLERY is probably a boarder, but could be their widowed daughter.

2.  The Raymond Martin Bell Anthology.   "The Families of George Ealy, East Finley Township, and Michael Ely, Buffalo Township, Washington [County], Pennsylvania" (online at the Washington Co., PA, GenWeb site).

3.  LDS.  Family Search: Internet Genealogy Service: International Genealogical Index (IGI).  Has Abraham the son of Jacob & Magdalene (ELY) HORN. 

Susan ELI Christening: 27 Sep 1789, Bindnagle Lutheran and Reformed Church, Derry Twp, Dauphin, Pennsylvania Father: Michael ELI; Mother: Mary Regina Source:  Bindnagle Lutheran and Reformed Church, Derry Township, Dauphin, Pennsylvnia computer printout; births or christenings, 1724-1793 by the Genealogical Dept. of the LDS

Abraham HORN Birth: 2 Jan 1813, Washington, Pennsylvania Father: Jacob HORN; Mother: Magdalene ELEY Source: patron submission

4.  LDS.  Family Search: Internet Genealogy Service: Ancestral File.  Has Abraham the son of Jacob ELY & Magdalene ELY. 

5.  WorldConnect (online at RootsWeb.com).  Has Abraham the son of Joseph & Susanna (ELY) HORN.