1899-
| Willoughby, Lucille | |
| B: | 1899 |
| Colorado, USA | |
1907-1983
| Willoughby, Fred Thomas | |
| B: | 27 Jun 1907 |
| Colorado, United States | |
| D: | 16 Jan 1983 |
| Almeda, California, United States | |
1911-
| Willoughby, Frank | |
| B: | 1911 |
| Colorado, United States | |
1911-
| Willoughby, Francis | |
| B: | 1911 |
| Colorado, United States | |
1872-1952
| Douglas, Margaret Lydia | |
| B: | 15 Aug 1872 |
| Denver, Colorado, United States | |
| D: | 2 Nov 1952 |
| Willoughby, Frederick Delano | |
| B: | Oct 1870 |
| Denver, Arapahoe, Colorado, United States | |
| M: | 1898 |