Sarah Fuller is the sister of my ancestor, Mary Hawley Fuller. We were in Poultney VT last week for a conference. By chance, I met somebody connected with the Poultney Historical Society who gave me directions to the Isaac Fuller monument in the East Poultney Cemetery nearby. (I had looked for that cemetery a few years ago, but with no success.) The monument has the names of all the children on it, though they are not necessarily buried there. (Mary was buried in Burma.)
I have some info that I got in Poultney last week, and some more of Isaac's and his wife's, Mary Hart Hawley's, ancestors. Isaac and Mary were both born in Connecticut and died in Poultney.