John was born about 1790. John Crisp ... He passed away about 1861.
"William Mansell Crisp (1727 - 1819), Elizabeth Ramsey Crisp (1726 - 1819)" Parents according to find a grave Memorial of Mancil Crisp - Possible Brother.
Further..."Mancil Crisp represented Davy (Crokett) in law suits to recover debts that he owed in 1821 when floods wiped out Crockett's gristmill and distillery in Lawrence County (TN)."
Mancil succeeded Crockett in the TN House of Representatives ("The Frontiersman: Davy Crockett" by Mark Derr). One of those to whom a debt of $55 was owed was John R. Crisp. John R. Crisp (b. before 1775) was a brother of Mancil."
"...letter written by her grandfather, Thomas Benton Crisp, Sr (b. 1843), who was the son of Alexander R. Crisp (1804-1847). This information, along with a little research that I have done on the Internet, convinces me that Alexander was the fifth son of Mansil Crisp (b. 1788 SC), with other sons being William Mansel, Tilman, and Elihu of TN, and John Rogers Crisp of SC.
Alexander Roger Crisp (probably Andrew Rogers) has been largely unknown to Crisp list members."
Looking for more information...
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John Rodgers was born in 1790. John Rodgers Crisp ... He passed away in 1871.
↑ Rootsweb, CRISP-L Archives, CRISP-L, Alexander R. Crisp, son of Mancil, Fri, 24 May 2002 
It may be possible to confirm family relationships with John 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 DNA with John:
I thought something was wonky. I have initiated a merge of this John R. Crisp into the lower numbered John R. Crisp. We will have to merge the two Susans, but at least the rest of the family will be filled-in.
Crisp-585 and Crisp-356 appear to represent the same person because: Things looked a bit wonky to me...figured out that there are two of em'! This will merge them together. After this merge we will need to merge the children as well. Mags