Mercy appears to have been fibbing about her age beginning in mid-life, which would result in a false birthyear on her tombstone.

1.  Marriage Record:

2.  1820 Census Index/Images (online at Ancestry.com; Image #7 of 7; extracted by Diana Gale Matthiesen):

1820

RI

Washington Co.

Richmond Twp.

p. 103

Ln. 16

Ezekiel Teft Jr.

000100-21100-0-001

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	19-25*	1794-1801	= Ezekiel (b. 1799)
2 females	9 or under	1810-1820	= Daughter B = Daughter A
1 female	10-15	1804-1810	= ?
1 female	16-25	1794-1804	= Mercy
1	person engaged in manufacture
*In the 1820 Census, the third column is age class 16-18 and the fourth column is age class 16-25; therefore, any individual in column three is duplicated in column four.  By subtracting the number in column three from the number in column four, you can create an age class "19-25."

Listed next to Ezekiel's father, Ezekiel TEFT (Sr.).

3.  1830 Census Index/Images (online at Ancestry.com; Image #17 of 24; extracted by Diana Gale Matthiesen):

1830

NY

Chenango Co.

Smyrna Twp.

p. 229

Ln. 10

Ezekiel Tift Jnr

220 001 - 001 011

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	4 or under	1825-1830	= Son A = Palmer (b. 1827/8)
2 males	5-9	1820-1825	= Gardner (b. 1824/5) = William (b. 1821/2)
1 male	30-39	1790-1800	= Ezekiel (b. 1799)
1 female	10-14	1815-1820	= Daughter B
1 female	20-29	1800-1810	= ?
1 female	30-39	1790-1800	= Mercy

Listed one line below Samuel TIFT and five lines above William TIFT.  The elder Ezekiel TIFT is on p. 233.

4.  1840 Census Index/Images (online at Ancestry.com; Image #87 of 318; extracted by Diana Gale Matthiesen):

1840

OH

Columbiana Co.

St. Clair Twp.

p. 156A

Ln. 28

Ezekiel Tefft

002 000 100 - 000 010 100

0001000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	10-14	1825-1830	= Palmer (b. 1827/8) = Gardner (b. 1824/5)
1 male	40-49	1790-1800	= Ezekiel (b. 1799)
1 female	20-29	1810-1820	= Daughter B
1 female	40-49	1790-1800	= Mercy
1	person employed in manufactures and trades

Listed one line below son, William TEFFT.

5.  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				"

Mercy has begun to fib about her age (she should be at least 49).  Nathan must be a grandson (or nephew) as he is not with our subjects in the 1840 census.  Leah is Gardner's wife, and Stephen is their son.

6.  1860 Census Images (online at Ancestry.com; Image #10 of 40):  Perrysburg P.O., Town Perrysburg, Wood Co., OH, p. 396, B, PN 133, 900/899, enumerated 29 Jun 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Ezekiel Lift	61	M		Miller	400	200	Rhod Island
Mercy    "	58	F					"
Nathan   "	21	M					Ohio
Mercy    "	7	F					"

Nathan and Mercy must be grandchildren.

7.  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
[Gardner & Leah's six children]
_____ Mercy	67	F	W				Rhode Island

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

Census Place: Freedom, Wood, Ohio
Source: FHL Film #1255078; NARA Film #T9-1078; Pg 156D
	Relation	Sex	Marr	Race	Age	Birthplace	Occupation	Fa	Mo
William V. B. TEFFT	Self	M	M	W	58	RI	Farmer	RI	RI
Hannah TEFFT	Wife	F	M	W	48	ENG	Keeping House	ENG	ENG
Charles W. TEFFT	Son	M	S	W	22	OH	Works On Farm	RI	OH
Mercy TEFFT	Mother	F	W	W	77	RI	Keeping House	RI	RI

Hanna must be William's second wife because Charles's mother was born in Ohio, not England.

9.  Messages in the TEFFT Family Genealogy Forum (online at GenForum.com).

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