The following data is extracted from Genealogy and Biography of Ontario County, New York.
Thaddeus, son of Jonathan (2) and Martha (Hawks) Oaks, was born in Conway, Massachusetts, and came to Phelps, with his father in 1790 and died there. He married Fanny Dickinson, also of Conway, Massachusetts. Children: Nathan, referred to below; Mary Lucretia, who married L. B. Hotchkiss, of Phelps, New York.
Source: Genealogy and Biography of Ontario County, New York