Rene Piatt died in New Jersey in 1705. Assuming that Lewis is a descent of Rene, how many generations of separation can there be--two, three? We don't know how Lewis's parents got to Westchester Co NY or who they were at this time. But if we could get a breakthrough, a lot of questions could be answered.
Lewis Piatt "entered the Service as a volunteer at the age of thirteen at Longridge, Westchester Co NY, under the Command of Captain Ayers and Colonel Courtland, to guard cattle and served a tour of three months, guarding cattle day and night, being on duty constantly, when he was discharged." His third and fifth tours were also entered into in Westchester Co NY. He second and fourth tours were entered into in Connecticut.
After the war Lewis moved to Sussex Co NJ where he lived about 10 years. Is this a clue that he had family in this county? It could be beneficial to look at tax records for Sussex Co NJ for 1781-1791 to see which Piatts lived there at that time.
Then he moved to Westmoreland Co PA. Lewis Piatt married in Westmoreland Co PA on 1 Feb 1791 to Catherine McHenry. Subsequently he made records in Ohio Co (W)VA from at least 1806 to 1819. In 1820 he was listed in the census of Tiffin Twp, Adams Co OH. He died in Jefferson Twp, Adams Co OH on 6 Oct 1851.
If the link between Lewis and Rene could be established then the degree of cousinship could be established between Lewis and the Cincinnati Piatts. Source: