1879 - 1954 (75 years)
| Leonard T. Clark, ^ | |
| B: | 1944 |
| Brookhaven, Suffolk, New York, United States | |
| D: | 19 Feb 1958 |
| East Patchogue (Brookhaven Memorial Hospital), Brookhaven, Suffolk, NY | |
| Leonard Jerome Clark | |
| B: | 20 May 1909 |
| D: | 28 Oct 1989 |
| Franklin, Warren, New Jersey, USA | |
| Annemarie Thomas Clark, ^ | |
| B: | Abt 1910 |
| D: | Yes, date unknown |
| Ann J Clark | |
| B: | 1879 |
| Irish Free State | |
| D: | 2 Aug 1954 |
| Brighton, Kings, New York, United States | |
| Leonard Knight Clark | |
| B: | 28 Sep 1879 |
| Highlands, Campbell, Kentucky, United States | |
| D: | 1968 |
| Florida, United States | |
