Dr. John & Sarah shown as having 6 children: H.C. born 10 Feb 1843 and d 27 April 1851; Mary E. b 3 Sept 1841; Sarah I. b. 5 Sept 1846; Julia b. 5 Apr 1849; Horace Greeley b 16 Jul 1850 and Queen N. b 22 Dec 1852.The 1850 and 60 census should help confirm.I'm in Mass and so can't check local birth records.
Horace G. shown as practicing medicine in Humbolt, Allen Co., Kan.
Also:Mrs. Slavens' parents died in Orange Co, IN when she was a child.