1.  Jordan R. Dodd, ed.  1998.  Marriage Index: Ohio, 1851-1900.  Liahona Research, Orem, UT (Broderbund CD-236):  not found, but there are no Clermont Co. marriages on this CD.

2.  1870 Census Images (online at Ancestry.com; Image #4 of 7):  Goshen P.O., Village of Goshen, Goshen Twp., Clermont Co., OH, p. 87B, PN 4, 31/32, enumerated 2 Jun 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Doughman Jeff. T.	25	M	W	Farmer	150	360	Ohio
________ Eliza	21	F	W	Keeping House			Ohio
________ Luther	1/12	M	W	At Home			Ohio	May
Stroup Peter	66	M	W	Retired Farmer	6000	1000	Ohio

Living next door to Jefferson's father, Henry DOUGHMAN.  Peter STROUP is the widowed brother of Jefferson's paternal grandmother, Elizabeth (STROUP) DOUGHMAN. 

3.  1880 United States Census and National Index (LDS Family History Resource File: CD-ROM Library):

Census Place: Goshen, Clermont, Ohio
Source: FHL Film 1255000; NARA Film T9-1000; Pg 92B
	Relation	Sex	Marr	Race	Age	Birthplace	Occupation	Fa	Mo
Thomas J. DOUGHMAN	Self	M	M	W	35	OH	Works On Farm	OH	OH
Eliza J. DOUGHMAN	Wife	F	M	W	26	OH	Keeping House	OH	OH
Nellie DOUGHMAN	Dau	F	S	W	8	OH		OH	OH
Mamie DOUGHMAN	Dau	F	S	W	5	OH		OH	OH
Frankie DOUGHMAN	Son	M	S	W	2	OH		OH	OH

Listed four households from Thomas's father, Henry DOUGHMAN, in one direction; and, in the other direction, listed 12 households from Thomas's brother, John H. DOUGHMAN.