I saw your postings, but was not sure if you were looking for additional information on the family.I found the following entry in "The Past and Present of Warren County, Illinois - 1877"
Voters and Taxpayers of Hale Township (Page 262) - RINEHART DAVID W. Farmer and Stock Raiser; Sec. 34; P.O. Monmouth; born in Ulster Co., N.Y., in Oct. 1824; came to this county in 1854; Dem; Presb.; owns 165 acres, valued at $12,300; holds the offices of Pathmaster and School Director; his wife was Maria Bruyn; she was born in Ulster Co., N.Y., in 1832; married in Dec., 1854; they have eight children, William, Nathaniel, LeFevre, Headley, John, Cornelia, Laura, and Chas.
1900 US Census - Hale Township, Warren County, Illinois NASeries: T623Roll: 350Page: 51Sheet: 5BED: 87Date: 15 June 1900D/F: 94/94 D. W. Rhinehart, Head W M Oct 1824 75 Married 46 Yrs. NY NY NY Farmer Owned Free Farm Maria Rhinehart, Wife W F March 1832 68 Married 46 Yrs. 8 Children, 8 Living NY NY NY Lefever Rhinehart, Son W M June 1861? 39? Single IL NY NY Farmer Owned Mortgage Farm H. Rhinehart, Son W M July 1862 37 Single IL NY NY Farmer Laura C.? Rhinehart, Daughter W F Dec 1870 30 Single IL NY NY Charles Rhinehart, Son W M Aug 1875 24 Single IL NY NY Farmer
As the family was listed as Presbyterians in Hale Township, it may be likely that they were members of the Sugar Tree Grove Church, and possibly buried there as well.