Robert Oliver Logan, son of Andrew Jackson “Jack” Logan and Catherine Charlotte Guthrie Logan, was born 14 April 1877 in Washington County, Illinois. He married Gail Watson 18 or 19 February 1907 in Clayton, St. Louis County, Missouri. They lived in Ashley, Washington County, Illinois, and Centralia, Marion County, Illinois. Daughter, Frances Catherine or Kathryn Logan, was born 13 September 1910 in Ashley, Illinois.
Gail Watson Logan died 15 March 1945. Robert O. Logan died 27 June 1946. Frances Catherine Logan married John Merkelbach. She died 11 March 1995. All three are buried at I.O.O.F. Cemetery, Ashley, Washington County, Illinois, as is another child of Robert O. and Gail Logan, Robert Joseph “Bobby Jo” Logan, born 5 October 1919, died 20 August 1921, and John Merkelbach.