John Allen III, son of John II and Phebe Scarlett Cox Allen, was born March 22 1749 in Chester, Pa and died September 23 1826 in Snow Camp, Orange County, NC. He married Rachel Stout, daughter of Peter and Margaret Cypert Stout, April 9 1779 in Orange County, NC. He was a teacher and was honored for his contributions with a large stone tombstone in 1926. He also ran a store in one room of his small home, said to have gone to Philadephia, PA for supplies twice a year and had books in his home that named early settlers in the area. The books are now in the Archives of in Raleigh, NC and the large home he built was restored and moved to the Alamance Battlefield, NC. More about the home and his life may be found here.
Their children as named in his will were: 
John b May 28 1780, m Dinah Allen, daughter of John and Elizabeth Stuart Allen
Peter b Aug 1 1781, m Elizabeth Dixon
Joseph b Jun 9 1783
Samuel b Sep 24 1785, d Jun 24 1787
Nathan b Jun 4 1787, d Nov 24 1820, m Martha Cox, daughter of Thomas and Emey Cox, his widow and children are named.
Phebe b Nov 29 1789
Harmon (Hermon) b Dec 12 1791
Rachel b Mar 10 1794
The administration of the probate of the actual will cited above is interesting reading.
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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: