Said to have died in Fulton Co., OH, but Gardner was living in Henry Co., OH, in the 1870 Census.  Although two of his children were in Fulton Co., OH, in the 1880 census, his widow was in Wood Co., OH, in 1880; Leah did not appear in the Fulton Co., OH, census until 1910.

— born in OH, either Wood Co. or Henry Co.:
6.  Louisa TEFFT, b. 1861/2
7.  Rowland Gardner TEFFT, b. 5 Apr 1865; d. 9 Feb 1946, Wood Co., OH
8.  William TEFFT, b. 1871/2

1.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org):

Gardner TEFFT Spouse: Leah WOLLAM Marriage: 05 Oct 1848, Wood, Ohio Source: Marriage Records, 1820-1929. Ohio. Probate Court (Wood County)

2.  1850 Census Index/Images (online at Ancestry.com; Image #32 of 44):  Perrysburg Twp., Wood Co., OH, p. 119B, 212/218, enumerated 1 Aug 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

E Tifft	51	M		Farmer		Rhode Island
Mercy Tifft	47	F				"
Gardner   "	25	M		Farmer		NY
Palmer    "	22	M		Farmer		"
Nathan    "	11	F				Ohio
Lean/Lear "	17	F				"
Stephen   "	1	M				"

"E." (Ezekiel) & Mercy are Gardner's parents.  Palmer is Gardner's brother, and Nathan is probably Gardner's nephew.

3.  1860 Census Images (online at Ancestry.com; Image #11 of 17):  Scotch Ridge P.O., Webster Twp., Wood Co., OH, p. 449A, PN 232, 1676/1643, enumerated 19 Jul 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Gardner Teft	36	M		Miller	1000	700	New York
Leah	28	F					Ohio
Stephen	10	M					"
Mary	9	F					"
Mercy	6	F					"
Asathura?	4	F					"
Susan	1	F					"

The name of the third daughter is not really readable.  Gardner is said to have had a daughter, Anastasia, so that must be the name the enumerator couldn't deal with (over and above the problem of his atrocious handwriting).  Listed three households from Gardner's brother, William TEFT.

4.  1870 Census Images (online at Genealogy.com; Image #27 of 29):  Napoleon P.O., Washington Twp., Henry Co., OH, Roll 1221 (Book 1), p. 425A, PN 27, 205/195, enumerated 14 Aug 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Tefft G R	46	M	W	Lumber Dealer	2000	1800	York State
_____ Leah	39	F	W	Keeping house			Ohio
_____ Stephen	31	M	W				Ohio
_____ Mary	19	F	W				Ohio
_____ Mercy	16	F	W				Ohio
_____ Susan	11	F	W				Ohio
_____ Louisa	8	F	W				Ohio
_____ Rowland	5	M	W				Ohio
_____ Mercy	67	F	W				Rhode Island

Stephen is 21, not 31.  Mercy is Gardner's mother.

5a.  LDS.  Family Search: Census Records: 1880 United States (online at FamilySearch.org):

Census Place: Portage, Wood, Ohio
Source: FHL Film #1255078; NARA Film #T9-1078; Pg 111C
	Relation	Sex	Marr	Race	Age	Birthplace	Occupation	Fa	Mo
G. W. CUPP	Self	M	M	W	40	OH	Farmer	OH	OH
Leah CUPP	Wife	F	M	W	41	OH	Keeping House	OH	OH
Ulyssis CUPP	Son	M	S	W	17	OH	At Home	OH	OH
James CUPP	Son	M	S	W	15	OH	At Home	OH	OH
William TEFT	SSon	M	S	W	8	OH		OH	OH

Ulysses and James are George's sons from a prior marriage; William is Leah's youngest son from her marriage to our subject.

5b.  LDS.  Family Search: Census Records: 1880 United States (online at FamilySearch.org):  our subjects' son, Rowland TEFFT (æ 15, b. OH), is living with his married sister, Mary (TEFFT) DETWILER (æ 27, b. OH), in Swan Creek Twp., Fulton Co., OH.

6.  1890 Census:  the 1890 Population Schedules were destroyed.

7.  1900 Census:  Leah (WOLLAM) TEFFT CUPP, is still living in Wood Co., OH, with husband, George Washington CUPP.

8.  1910 Census:  Leah (WOLLAM) TEFFT CUPP, is living with husband, George Washington CUPP, in Swan Creek Twp., Fulton Co., OH.

9.  Broderbund.  World Family Trees.  Vol. 10, Pedigree #2223.

10.  Rachel Saul Tefft.  1999.  Descendants of Gardner Rowland Tefft (1824-72).  Apparently self-published (on sale at higginsonbooks.com).  Not seen by me; just citing FYI.