The will of Nicholas Northup of North Kingstown mentions his (probably third) wife Sarah, four unnamed daughters, and the following sons: William, Thomas, Gideon, Nicholas, and Rouse. I do not know which children were born of which wife.
Some genealogies have his first wife as Abigail Slocum or Abigail Eldred. I have not been able to confirm this, but have included her with some estimated dates, pending further research. If Nicholas was in fact married before he married Freelove, some of the children -- particularly Thomas -- may have been of this first marriage.