1780 - 1870 (90 years)
| Helen Gertrude Decost | |
| B: | 12 Mar 1903 |
| Maine, USA | |
| D: | Abt 1964 |
| Louis Mastrangelo | |
| B: | 10 Sep 1905 |
| Massachusetts, USA | |
| D: | 28 Jan 1999 |
| Watertown, Middlesex, Massachusetts, USA | |
| Benjamin Decoste | |
| B: | Aug 1865 |
| Mulgrave, Guysborough, Nova Scotia, Canada | |
| Annie M Romer | |
| B: | 1877 |
| Tremont, Hancock, Maine, USA | |
| M: | 29 Jun 1898 |
| Tremont, Hancock, Maine, USA | |
| D: | Abt 1965 |
| Edouard de Coste | |
| B: | 1820 |
| Havre Boucher, Antigonish, Nova Scotia, Canada | |
| D: | 1881 |
| Mulgrave, Guysborough, Nova Scotia, Canada | |
| Rosalie Ivon | |
| M: | 21 Jan 1845 |
| Havre Boucher, Antigonish, Nova Scotia, Canada | |
| Osite Levandier | |
| B: | 1780 |
| Antigonish, Nova Scotia, Canada | |
| D: | 25 Mar 1870 |
| Antigonish, Nova Scotia, Canada | |
| Jean-Baptiste Coste | |
| B: | Aft 1771 |
| Arichat, Richmond, Nova Scotia, Canada | |
| M: | 1803 |
| D: | Aft 1856 |
| Havre Boucher, Antigonish, Nova Scotia, Canada | |
We make every effort to document our research. There is a lot of information that I do not have, and I know there are mistakes in this tree. My feelings will not be hurt if you give me corrections or additional information, especially if you can provide sources for the information.
