John Harris ... son of Henry (deceased) of New London, married Lydia Way (daughter of Daniel of New London) on Jan 16, 1755. They had a son John on Sept 7, 1757. And another son Henry b. Sep. 26, 1763. 
No more info is currently available for John Harris. Can you add to his biography?
Jay Byrne, Ancestry.com - Connecticut Town Birth Records, pre-1870 (Barbour Collection) Record for Harris. See the Changes page for the details of edits by Jay and others.
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: