Who is the father of Sarah A. Schoonmaker?

DC of Lorenzo T. Thorn, 31 May 1910, lists father as William C. Thorn (b. in town of Rochester, NY), wife Sarah A. Schoonmaker (b. in town of Rochester, NY). The place of death for Lorenzo is Kingston, NY. Searching for parents of William C. Thorn (bd ???) or parents of Sarah A. Schoonmaker (bd???).