From 'Biographical and Historical Memoirs of Louisiana', which was not a contemporary source but was published in 1892, and the section on Thomas East was seemingly supplied by his grandson Thomas L. East (born 1832):
"Thomas East, grandfather of Thomas L. East, married Nancy Caldwell, who was a first cousin to Hon. John C. Calhoun, and they moved to Calhoun county, Ky., Mr. East, who was a man of some means for that day, being obliged to make three trips to bring out his family, stock and other belongings. The way was through an almost unbroken wilderness. One trip Mr. East made alone, to drive his live stock. The family left Caldwell county late in 1810, going by flatboats from Smithland, on the river, and in company with a McKnab family, landed at Bayou Sara in February, 1811, and settled on Little Redwood creek, now in the Third ward of East Feliciana parish, on the property now owned by Thomas L. East. Here he began the work of redeeming a farm from the wilderness, but before many years removed to a place on what is now known as Hog branch in Livingston parish, La. After a few years' residence there, he removed to Mississippi and and bought land near the present sight of Brookhaven, where East & Sons are now located, and there lived for many years, until well advanced in life, finally returning to East Feliciana parish and dying there in 1840, three miles west of Clinton, which place he had owned."
Sources
"Louisiana, Tombstone Inscriptions, 1812-1970," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:74RB-XM2M : 21 August 2019), Thomas East, 10 Jun 1840; citing Death, Louisiana, United States, National Society of the Daughters of the American Revolution, Washington, D.C.
"United States Census, 1820," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHLW-KJX : accessed 24 September 2019), Thomas East, Rich Land Creek, Feliciana, Louisiana, United States; citing p. 58, NARA microfilm publication M33, (Washington D.C.: National Archives and Records Administration, n.d.), roll 31; FHL microfilm 181,357.
WikiTree profile East-261 created through the import of Laura's Family Tree_2012-04-21.ged on May 4, 2012 by Laura Mittler. See the Changes page for the details of edits by Laura and others.
Source: S45 Author: Yates Publishing Title: U.S. and International Marriage Records, 1560-1900 Publication: Name: Online publication - Provo, UT, USA: Ancestry.com Operations Inc, 2004.Original data - This unique collection of records was extracted from a variety of sources including family group sheets and electronic databases. Originally, the information was derived; Repository: #R1
Source: S69 Title: Ancestry Family Trees Publication: Name: Online publication - Provo, UT, USA: Ancestry.com. Original data: Family Tree files submitted by Ancestry members.; Repository: #R1 NOTEThis information comes from 1 or more individual Ancestry Family Tree files. This source citation points you to a current version of those files. Note: The owners of these tree files may have removed or changed information since this source citation was created.
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DNA Connections
It may be possible to confirm family relationships with Thomas by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Thomas: