- 1 Jean Gasnier (St My) m (1705, St My) Elizabeth Hamon
- 2 Jean Gasnier (St My) (1705- ) m (1747, St My) Susanne Neho (St O)
- 3 Jean Gasnier (1749- ) (St My) m (1768, St My) Rachel Robert (1750- ) (St My) probably daughter of Philippe and Rachel Renouf
- 4 Philippe Gasnier (1769- ) (St My)
- 4 Jean Gasnier (1771- ) (St My)
- 4 Pierre (1776- ) m (1795, St My) Marie Copley (St My) daughter of Jean and Marie Christin [1]
- 5 Marie Gasnier (1796- ) (St My)
- 5 Jeanne Gasnier (1798- ) (St My)
- 5 Pierre Gasnier (1799- ) (St My) [2] m (1826, St My) Susanne Malzard (1801- ) (St O) daughter of Edouard son of Edouard son of Pierre, and Elizabeth Le Feuvre dit Filliastre
- 6 Pierre Gasnier (1826- ) (St My) [3] m (1858, St S) Mary Ann Napper (1834-) (St L) daughter of John and Betsey Amy
- 7 Mary-Ann Elizabeth Gasnier (1857-1858) (St H)
- 7 Agnes Mary-Ann Gasnier (1859-1860) (St H)
- 7 Peter Thomas Gasnier (1860-1939) (St H) m (1890, St ) Florence Annie Le Boutillier (1868-) (Tr) daughter of Daniel and Elise Larbalestier
- 7 Rosina Mary Ann Gasnier (1864-before 1888) (St H) m (1885, St My) Peter Sauvage (-) son of John and Jane Hotton [m2 (1888, St P) Elizabeth Jane Egre]
- 6 Philip Gasnier (1828- ) (St My) m (1852, St H) Louisa Deamon (1833-) (St H) daughter of Samuel and Mary
- 7 Louisa May Gasnier (1859-) (England)
- 7 Philip Samuel Gasnier (1861-1947) (England) m (1888, Australia) Louisa Mauger Malzard (1869-1929) (Australia) daughter of John and Elizabeth Hooper
- 7 Frank Gasnier (1863-) (England)
- 7 Moses Gasnier (1867-) (England)
- 7 John Gasnier (1875-) (England)
- 6 Sukey Gasnier (1830- ) (St My) m (1859, St O) Helier/Elias Arthur (1830-) (St J) son of Noe and Rachel Hamon
- 6 Jane Gasnier (1832- ) (St My) m (1874, St S) Philip Clement Frederick Jeune (1841-) (Gr) son of Philippe and Susanne Elizabeth Bree
- 6 Mary Ann Gasnier (1833- ) (St My) m (1867, St S) John Bryant (1845-) (St H) son of Henry and Jane Kelloway
- 6 Rachel Gasnier (1834-1915) (St My) m (1867, St S) Philippe Josue de la Haye (1841-1902) (Tr) son of Philippe and Rachel Le Masurier [4]
- 6 Henriette Gasnier (1838- ) (St My) m (1867, St H) Philip Malzard (1838-) (St My) son of Jean and Marie Romeril
- 6 Ann Gasnier (1840- ) (St My) m (1864, St S) Philip Le Blancq (1839-) (St O) son of Philip son of Gedeon and Marie Luce
- 6 John Gasnier (1842-1891) (St My) [5] m (1878, St H) Amelia Le Gresley (1847-1913) (St O) daughter of John and Betsey Bailhache [6]
- 7 John Bailhache Gasnier (1879- ) (St J) [7] m (1904, St P) Azeline Mary Cornec (1883-1958) (St My) [8] daughter of Mathurin and Marie Jeanne [9]
- 8 Harold Reginald Gasnier (1912-1985) m (1935, Southampton) Kathleen Marion Wood (1915-2000)
- 7 Amelia Louisa Bailhache Gasnier (1880-1884) (St J)
- 7 Wayland Philip Bailhache Gasnier (1886-1901) (St J)
- 7 John Bailhache Gasnier (1879- ) (St J) [7] m (1904, St P) Azeline Mary Cornec (1883-1958) (St My) [8] daughter of Mathurin and Marie Jeanne [9]
- 6 Thom Gasnier (1844-1844) (St My)
- 6 George Gasnier (1847- ) (St My)
- 6 Pierre Gasnier (1826- ) (St My) [3] m (1858, St S) Mary Ann Napper (1834-) (St L) daughter of John and Betsey Amy
- 5 Nancy Gasnier (1802- ) (St My)
- 5 Susanne Gasnier (1804- ) (St My)
- 3 Marguerite Gasnier (1751- ) (St My)
- 3 Elizabeth Gasnier (1754- ) (St My)
- 3 Thomas Gasnier (1756- ) (St My)
- 3 Michel Gasnier (1759- ) (St My) twin
- 3 Jean Gasnier (1759- ) (St My) twin
- 3 Susanne Gasnier (1762-1824) (St My) m (1797, St My) Thomas Giot dit la Source
- 3 Elizabeth Gasnier (1764- ) (St My)
- 3 Jean Gasnier (1749- ) (St My) m (1768, St My) Rachel Robert (1750- ) (St My) probably daughter of Philippe and Rachel Renouf
- 2 Benjamin Gasnier (1706- ) (St My)
- 2 Thomas Gasnier (1710- ) (St My)
- 2 Thomas Gasnier (1713- ) (St My)
- 2 Samuel Gasnier (1716- ) (St My)
- 2 Catherine Gasnier (1720- ) (St My)
- 2 Elizabeth Gasnier (1725- ) (St My)
- 2 Jean Gasnier (St My) (1705- ) m (1747, St My) Susanne Neho (St O)