1871 - 1957 (86 år)
| Leonard Robert McDowall | |
| F: | 18 Jul 1909 |
| Ryan, Delaware County, Indiana, USA | |
| D: | 15 Nov 1965 |
| Sycamore, DeKalb County, Illinois, USA | |
| Ethel Charlotte Kellogg | |
| F: | 21 Mar 1927 |
| Genoa, DeKalb County, Illinois, USA | |
| V: | 30 Apr 1949 |
| DeKalb, DeKalb County, Illinois, USA | |
| D: | 17 Maj 2010 |
| DeKalb, DeKalb County, Illinois, USA | |
| Ronald McDowall | |
| F: | 19 Jul 1934 |
| Elk, Delaware County, Iowa, USA | |
| D: | 8 Dec 2014 |
| DeKalb, DeKalb County, Illinois, USA | |
| Phyllis Ann McDowall | |
| F: | 26 Jul 1937 |
| Woodstock, McHenry County, Illinois, USA | |
| D: | 21 Feb 1961 |
| Woodstock, McHenry County, Illinois, USA | |
| Helen Lorraine Martin | |
| F: | 9 Aug 1913 |
| Honey Creek Township, Delaware County, Iowa, USA | |
| V: | 12 Aug 1933 |
| Independence, Buchanan County, Iowa, USA | |
| D: | 27 Jun 2004 |
| Sycamore, DeKalb County, Illinois, USA | |
| Matthew Andrews McDowall | |
| F: | 24 Mar 1871 |
| Old Luce, Wigtownshire, Scotland | |
| D: | 30 Mar 1957 |
| Oelwein, Fayette County, Iowa, USA | |
| Mattie Lois Kaster | |
| F: | 9 Mar 1881 |
| Rock Rapids, Lyon County, Iowa, USA | |
| V: | 15 Feb 1901 |
| Delaware County, Iowa, USA | |
| D: | 15 Maj 1920 |
| Manchester, Delaware County, Iowa, USA | |
