Max - "History of Hardin Co., OHio," 1883 [reprint 1973, Unigraphics, Inc.] - Biographical Sketches, pg. 920:
Samuel Riley Calvin, farmer, P.O. Kenton, was born in Lawrence Co., Penn., Nov. 1, 1835. He is a son of GEORGE and Elizabeth [Lightner] Calvin, the former from Ireland, and the latter from Pennsylvania...etc.
George Calvin apparently died before the 1850 census when Elizabeth was listed in Lawrence Co., PA,Wayne Twp., as head of household with her children Jesse, age 18, Samuel, age 15, Rachel, age 12, Lorenzo, age 8, Leander age 6, and Theodore Miller Calvin age 2.