1897 - 1973 (76 years)
| Helen Alvaretta Riggs | |
| B: | 16 Sep 1929 |
| Boone, Boone County, Iowa | |
| D: | Unknown |
| Vernon Eugene Carlson | |
| B: | 9 Jun 1923 |
| Boone, Boone County, Iowa | |
| M: | 24 Jan 1948 |
| Boone, Boone County, Iowa | |
| D: | 15 Jun 1988 |
| Phoenix, Maricopa County, Arizona | |
|
| Howard Lee Riggs | |
| B: | 26 Jul 1897 |
| Bismarck, Burleigh County, North Dakota | |
| D: | 23 Aug 1973 |
| Boone, Boone County, Iowa | |
| Harrietta Gibson Fisher | |
| B: | 4 Dec 1904 |
| Boone, Boone County, Iowa | |
| M: | 20 Apr 1924 |
| Boone, Boone County, Iowa | |
| D: | 10 Aug 1988 |
| Des Moines, Polk County, Iowa | |
