I've recently found that Isaac Newton Williams (1840-1920), son of Samuel I. & Kesiah Williams DID NOT marry second Salome Nidy, 8 May 1881, Greene Co., Ind. The Isaac Newton Williams that married Salome Nidy was born 1861 died 1930 and is buried in Lebanon Cem., Greene Co., Ind. along with his wife. They are found in census records in Greene Co., Ind.
As far as I've found so far, Isaac Newton William (1840-1920), son of Samuel I. & Kesiah Williams married Mary Ann Howell 1861 Jeff. Co., Ill. then he married Isabelle Esther (Whiteaker) Thomas ca. 1894. Isabelle had married Isaac Thomas, 1 Sep 1870, Dent Co., Mo. She was born 15 Mar 1850 Claiborne Co., Tn. Her parents were Jos. and Margaret Anne (Hamilton) Whiteaker.