I just found Sarah on GenealogyLibrary.com.She is listed in a Barnes genealogy as the daughter of Benjamin Barnes who m. Sarah Hill, dau. of Obadiah & Hannah (Frost) Hill.It lists Sarah as the only child, b. 13 July 1750, m. 1 Oct. 1770 to Elisha Alderman of Simsbury.
I suppose this is old news to you.Their children are not listed.
The book it came from was Families of Ancient New Haven Vol. 1, pg. 119.