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 .
Adolph received the Upper Mills property , which extended from Dobbs Ferry to the Croton River .
Frederick II was given the Lower Mills at the confluence of the Saw Mill and Hudson Rivers , the two parcels being reunited on Adolph 's uncle 's death .
Adolph received the Upper Mills property , which extended from Dobbs Ferry to the Croton River .