1876 - 1936 (60 år)
| Jr Alvin Donald Irwin | |
| F: | 30 Nov 1917 |
| Springfield, Sangamon County, Illinois, USA | |
| D: | 28 Feb 2006 |
| Springfield, Sangamon County, Illinois, USA | |
| Clara Lou Barnett | |
| F: | 14 Sep 1931 |
| Springfield, Sangamon County, Illinois, USA | |
| D: | 16 Jun 2001 |
| Springfield, Sangamon County, Illinois, USA | |
| Katherine Kay Barnett | |
| F: | 29 Nov 1932 |
| Springfield, Sangamon County, Illinois, USA | |
| D: | 16 Apr 1988 |
| Eugene, Lane County, Oregon, USA | |
| Shirley June Barnett | |
| F: | 30 Jun 1930 |
| Springfield, Sangamon County, Illinois, USA | |
| D: | 2 Jul 1994 |
| Springfield, Sangamon County, Illinois, USA | |
| Carol Margarete Irwin | |
| F: | 24 Dec 1911 |
| Minneapolis, Hennepin County, Minnesota, USA | |
| D: | 13 Apr 1997 |
| Springfield, Sangamon County, Illinois, USA | |
| John Lewis Irwin | |
| F: | 3 Feb 1920 |
| Springfield, Sangamon County, Illinois, USA | |
| D: | 1 Jan 2006 |
| Sainte Genevieve, Sainte Genevieve Township, Sainte Genevieve County, Missouri | |
| Virginia Marie Hershey | |
| F: | 12 Jul 1921 |
| Springfield, Sangamon County, Illinois, USA | |
| D: | 24 Apr 2011 |
| Sainte Genevieve, Sainte Genevieve Township, Sainte Genevieve County, Missouri | |
| Vera Osee Irwin | |
| F: | 25 Jul 1913 |
| Springfield, Sangamon County, Illinois, USA | |
| Alvin Donald Irwin | |
| F: | 16 Mar 1876 |
| Missouri, USA | |
| D: | 27 Apr 1936 |
| Springfield, Sangamon County, Illinois, USA | |
| Clara Henrietta Tokheim | |
| F: | Mar 1892 |
| Thor, Humboldt County, Iowa, USA | |
| D: | 1963 |
