Thomas Stockton was a son of Margaret (nee unknown) and "Smith Creek" John Stockton (c.1763-c.1803). Thomas is reported to have been born on January 23, 1792, and died on April 16, 1872. However, there is no evidence those dates are correct, and Thomas is not shown with his wife and children in the 1870 census. It appears that Thomas probably died about 1865. Thomas was alive in 1860 and appears to be dead by 1870. That 1865 date might just be the midpoint between 1860 when he is known to be alive and 1870 where he appears to already be dead.

His first wife was Christine / Christina / Christiana Groce, and his second wife was Mary Pierce. Thomas lived in Stockton's Valley, Kentucky, named after his grandfather, Thomas Stockton, Sr., (c.1740-1809).
In 1837 Cumberland County split and Stockton's Valley was in the newly formed Clinton County.

The 1850 census shows Thomas as 58 years old, so born about 1792. The 1860 census shows "Thos" Stockton as 70 years old, so born about 1790.

Thomas Stockton was first married to Christine Groce. Her name is shown on two documents. The Death Certificate of her daughter Martilla (nee Stockton) Cross shows her as Christine Groce. Death Certificates are not the most reliable sources. The marriage license of her son Wiley S. Stockton shows her as Christiana.

Although no wife is shown for Thomas in the 1830 census, that does not prove Christine had died by 1830. She appears to have died in about 1838. Please see the Death Certificate for Martilla (nee Stockton) Cross. Father - Thomas Stockton. Mother - Christine Groce.

Death Certificate:
Martilla Cross
Place Died: Byrdstown, Pickett Co., TN
Date Died: Mar 18, 1916
Rheumatism, signed by L V Craig, MD, Byrdstown.
Female, white, widowed, date of birth "unknown", "above 80" is crossed out after unknown.
Born: Kentucky
Father: Thomas Stockton born Kentucky.
Mother: Christine Groce born Kentucky.
Informant: Jim Conner, Byrdstown, Tenn.

Thomas Stockton's 1st wife:
Christine (nee Groce) Stockton's children:
maybe a William, born about 1814
Catherine, born about 1819
Hamilton, born about 1824
Elizabeth, born about 1824
Margaret, born about 1826
Mary, born about 1828
~~~ 1830 no wife shown for Thomas ~~~
Allen, born about 1831
Wiley, born about 1835
Matilda/Martilla, born about 1838

Thomas Stockton's 2nd wife:
Mary (Pierce) Stockton's children:
Narcissa, born about 1844
Malissa, born about 1846
Thomas B., born about 1848
John F., born about 1849
Jesse C., born about 1852
Samuel C., born about 1853
Nancy J., born about 1856

1820 census, Cumberland County, Kentucky
Thomas Stockton 26-45 [about 28 years old]
f 16-26 [probably Christine]
m 0-10 [maybe William age 6?]
f 0-10 [Catherine age about 1]

1830 census, South of Cumberland River, Cumberland County, Kentucky
Thomas Stockton 30-40 [about 38 years old]
~~~ no female old enough to be a wife ~~~
m 15-20 [maybe William age 16?]
m 5-10 [Hamilton age 6]
f 10-15 [Catherine age 11]
f 5-10 [Elizabeth age 6]
f 0-5 [Margaret age 4]
f 0-5 [Mary age 2]

In 1835 Clinton County was cut from Cumberland County, Kentucky.

1840 census, Clinton County, Kentucky
Thomas Stockton 40-50 [about 48 years old]
f 20-30 [Mary Pierce 2nd wife age 21]
m 40-50 [maybe b-i-l]
m 20-30 [maybe William age 26?]
m 10-15 [Hamilton age 16]
f 15-20 [Margaret age 14]
f 5-10 [Mary age 12]
m 5-10 [Allen age 9]
m 0-5 [Wiley age 5]
f 0-5 [Matilda age 2]

1850 census, Clinton County, Kentucky
Thomas Stockton, 58, born in Kentucky
Mary Stockton, 31, Kentucky [nee Pierce, 2nd wife of Thomas]
Hammelton Stockton, 26, Kentucky [s/o Thomas and Christine]
Margaret Stockton, 24, Kentucky [d/o Thomas and Christine]
Mary Stockton, 22, Kentucky [d/o Thomas and Christine]
Allen Stockton, 19, Kentucky [s/o Thomas and Christine]
Wiley Stockton, 15, Kentucky [s/o Thomas and Christine]
Matilda Stockton, 12, Kentucky [d/o Thomas and Christine]
Malisey Stockton, 6, Kentucky [d/o Thomas and Mary]
Thomas B Stockton, 2, Kentucky [s/o Thomas and Mary]
John F Stockton, 1, Kentucky [s/o Thomas and Mary]
William Gross, 58, North Carolina

1860 census Clinton County, Kentucky
"Thos" Stockton, 70, North Carolina
Mary Stockton, 40, Tennessee
Narcissa Stockton, 16, Kentucky
Malissa C Stockton, 13, Kentucky
Thos B. Stockton, 12, Kentucky
John F Stockton, 10, Kentucky
Jesse C Stockton, 8, Kentucky
Samuel C Stockton, 7, Kentucky
Nancy J Stockton, 4, Kentucky

It appears that Thomas died after 1860 but before 1870, so about 1865.

1870 census Russell County, Kentucky
Stogton Mary, 50, Kentucky
- - - - - - Thomas B, 21, Kentucky
- - - - - - John F, 20, Kentucky
- - - - - - Jesse C, 18, Kentucky
- - - - - - Samuel C, 16, Kentucky
- - - - - - Nancy J, 14, Kentucky

1850 census, Clinton County, Kentucky
William Stockton, 36
[This might be the first son of Thomas and Christine (nee Groce) Stockton.]

See:
1810 census, Margaret, 45+
1820 census, Thomas, 26-45
1830 census, Thomas, 30-40
1840 census, Thomas, 40-50
1850 census, Thomas, 58, born in Kentucky
1860 census, Thos, 70, born in North Carolina
1870 census, Mary Stogton, 50, and 5 of her children, no Thomas

This Thomas Stockton of Stockton's Valley is NOT the same as "Esq." Thomas Stockton, born about 1785 and married Sarah Blake. Esq. Thomas Stockton lived in Roane County, Tennessee, and can be found in the 1850 census. He appears to be a son of Margaret (nee unknown) and John "The Signer" Stockton and a grandson of Rachel (nee Allen) and Thomas Stockton, Sr., (c.1714-1783).

Please see memorials:
Davis Stockton (c.1685-1761)
Richard Stockton Sr. (c.1710-1775)
Thomas Stockton Sr. (c.1740-1809)
"Smith Creek" John Stockton (c.1763-c.1803)
Thomas Stockton (c.1792-c.1865)