1879 - 1955 (75 years)
| Barbara Ellen Avery | |
| B: | 12 Mar 1950 |
| East Patchogue, Suffolk County, New York, United States of America | |
| D: | 11 Aug 2017 |
| East Patchogue, Suffolk County, New York, United States of America | |
| Mildred Agnes MacKenzie | |
| B: | 17 Aug 1908 |
| Chennai, Tamil Nādu, India | |
| D: | 26 Mar 2000 |
| Patchogue, Suffolk, New York, United States | |
| Humphrey Roger Avery | |
| B: | 2 Aug 1894 |
| Patchogue, Suffolk, New York | |
| M: | Abt 1948 |
| of Patchogue, Suffolk, New York | |
| D: | May 1983 |
| , Suffolk, New York | |
| Charles Francis Alexander MacKenzie | |
| B: | 31 Dec 1879 |
| Pictou, Nova Scotia, Canada | |
| D: | 19 Sep 1955 |
| Upper Darby, Delaware, Pennsylvania, United States | |
| Ellen Louisa Compton | |
| B: | 1875 |
| England, United Kingdom | |
| D: | 27 Oct 1911 |
| Chennai, Tamil Nādu, India | |
