A biosketch of a grandson reports [1]:
Peter Ellis De Cou. of Hamilton township, belongs to one of the oldest families in Mercer county, living now in the homestead of Samuel and Lucy Abbott with the date 1797 cut in the brick wall, being one of the county's historic places.
Joseph De Cou, grandfather of Peter Ellis De Cou, lived near Chesterfield. He married Sarah Ellis, and among their children was a son, Peter, of whom later.
Peter De Cou, son of Joseph and Sarah (Ellis) De Cou. married Mary De Cou, came in possession of the Pearson homestead in Nottingham township
[1] Francis Bazley Lee, ed., Genealogical and Personal Memorial of Mercer County, New Jersey, Vol. 2 (1907), 509, [HathiTrust], [GoogleBooks].