1867 - 1939 (72 år)
| John Russell Sinclair | |
| F: | 13 Jan 1904 |
| Alexander, Franklin County, Iowa, USA | |
| D: | 1 Jun 1974 |
| Oelwein, Fayette County, Iowa, USA | |
| Mayme Ethel Knudson | |
| F: | 6 Feb 1903 |
| Armstrong, Emmet County, Iowa, USA | |
| D: | 27 Jun 1976 |
| Des Moines County, Iowa, USA | |
| John Leo Sinclair | |
| F: | 1867 |
| Missouri, USA | |
| D: | 1939 |
| Clarion, Wright County, Iowa, USA | |
| Mabel Waddington | |
| F: | 18 Maj 1872 |
| Geneva, Franklin County, Iowa, USA | |
| D: | 11 Mar 1961 |
| Oelwein, Fayette County, Iowa, USA | |
