I'm not related only trying to help. If you check online at the Crawfordsville, Montgomery Co, Indiana library at:http://www.cdpl.lib.in.us/lh/http://www.cdpl.lib.in.us/lh/you will find obits available for both Wilder Dumont and Laura Rineart. Laura's was in the Crawfordsville Journal Review newspaper 30 April 1962, page 8, and Wilder Dumont Rinehart was 19 July 1937, page 8 col 1, as for the daughter OLIVE Lucille Rinehart she was mrd twice, first to a Hurbert Lough on 29 May 1914, you can view that image also on the site given..it states her parents as Wilder and Laura..she 2nd mrd Fred A Myers 26 Feb 1949. You could contact the library (the contact is online also) for a copy of the obits..And you might try to contact the Health Dept for a copy of the death records. In 1910 BROWN TWP MONTGOMERY CO, Indiana census records, Wilder D was 42, Laura L was 43 and Olive was 18.
Hope this helps, I'm still checking on the other names, will get back to you if I find anything.