If you haven't already found this information I hope this helps.
Andrew Mcelwain b: 26 May 1865, Ohio; d: 07 Nov 1916 at the age of 51 years, 5 months 12 day, Jennings, Putnam, OH; buried Salem Cemetery. He died from paralysis with contributing causation as an accident.Undertaker was Hartman and Sons of Columbus Grove, OH>
Married but wife's name not given. Occupation: farmer Father:Andrew Mcelwain; Mother: Patience (indexed as Paiting) Parcher.Informant for the information on the death certificate was Ernest Mcelwain of Ft. Jennings, OH.
Edna Schindler Mcelwain b: 27 Mar 1868 Ohio, d: 21 Sep 1927, Jennings Twp., Putnam, OH, a 60 years 5 months 24 days, occupation domestic, buried Salem Cemetery.Spouse Andrew Mcelwain, father Andrew Schindler, mother Hannah Carrie.Cause of death Bright's disease and anasarca.Hartman and Sons funeral home, Columbus Grove, OH.Looks like the information for the death certificate was provided by Mrs. Christ. Ureging.
There is also a record of Malinda Frances Heyd b: 16 Jun 1889, d: 09 Aug 1937 who married John Heyd and lived in Napoleon, Henry, OH.Her father's name was Andrew Mcelwain and mother's name was Edith Schindler.I don't know if these women are the daughter and wife of your Andrew Mcelwain, but might be something to look into.She died at the intersection of Routes 6 and 109 from an automobile accident at the age of 48 years 1 month, and 24 days.