His son , Frederick III , became the third lord of the manor in 1751 .
Frederick II was given the Lower Mills at the confluence of the Saw Mill and Hudson Rivers , the two parcels being reunited on his uncle 's death .
uncle 's son , Frederick II   , became the third lord of the manor in 1751 .
Frederick II was given the Lower Mills at the confluence of the Saw Mill and Hudson Rivers , the two parcels being reunited on his uncle 's death .