I have some info on the John AIRHART and Cecelia ROSE you are looking for.Cecelia was m. to a HOLY (George P. Holy?)before her marraige to John AIRHART.Her son Peter HOLY is buried beside John and Cecelia in the Centerhill Cemetary, Carroll County, Illinois.
Children: 1)John AIRHART m. Louise Hirschmiller as you suggested. ch: Henry J.; Albert E.; Daniel M.; daughter m. Oscar Mauer
2)Mary A. Airhart b. 1 May 1853 in Pa.d. 11 Nov 1932 in Carroll County.m. Harmon Lovingood Roberts in Carroll County, Illinois 8 Dec 1872ch: John; Adelia; Lillie; Harmon; Bert; Frank; Clarence.
After H.L. Roberts' death, Mary Airhart re-married Archie Hall on 3 June 1897 and they had one child:Hazel Amelia Hall who married Ray Hatfield.