**Aaron Wilbur Ertel Sr's actual final resting place is unknown. However his death record reported he died of heart disease at his home in Fort Acient and is buried in Maineville, Ohio. I believe it's more than likely he is buried in either the Ertel-Patterson Cemetery or the Maineville Cemetery based on the number of other Ertel's buried between these two cemeteries.
The following biography stated that he had only two children with his first wife. However records on AncestryCom & FindAGrave indicates that he actually had six children with each of his two wives. The children with his first wife Nancy Smoot - Thomas B., Daniel D., Marian Franklin, James Granville, Harriet A. and John W.. The children with his second wife Mary Anna Reins - Caroline Adline, Jeremiah G., Charles W., Samantha E., Eveline A. and Aaron Wilbur Jr..

From "History of Warren County" (Ohio)
WASHINGTON TOWNSHIP.
Page 1045
AARON W. ERTEL, farmer, P. O. Fort Ancient; was born in Hamilton Township, July 16, 1825.His parents, Daniel and Lydia Ertel, were natives of Warren and Hamilton Cos., respectively. The former was born Oct. 8, 1797, and the latter May 16, 1807. Our subjects father came with his parents, Daniel and Catharine Ertel, to this country in 1797, and settled in Hamilton Township, where they owned the first hand-mill to grind corn. Mr. Ertel's father died Nov. 6, 1878, and his mother Dec. 6, 1870. His grandfather, Aaron Boorone, served in both the war of 1812 and the Revolution, and was well acquainted with Gen. George Washington. Mr. Ertel, the subject of this sketch, passed his early ,life on his father's farm, and was married Sept. 12, 1849, to Nancy Smoot, who died April, 1862, and left two children--Francis M. and Granville (deceased), Oct. 5, 1863. Mr. Ertel was united in marriage to Mary A. Reins, by whom he has had six children-Jerémiah G., Charles S., Samantha E., Eva, Aaron W. and Caroline I (deceased). In September, 1849, Mr. Ertel removed to Clinton Co., where he lived till March, 1867, Washington Township, where he owns a farm of 172 acres with excellent improvements. He donated 1 acre to the Freewill Baptist Church, and at the building of the church gave $300. Politically Mr. Ertel is an adherent to Republicanism.