From the St Lawrence baptism register,

August 1839 William George Mauger, son of Edouard Mauger and Marie Elizabeth Wright.

Lots of siblings,

1818 Edouard
1820 Marie - this entry says daughter of Edouard Jnr
1820 Elizabeth
1822 Harriet
1824 Jane
1827 Edouard
1829 George William
1831 Jean (John)
1834 Charles Samuel
1836 Harriette
1841 Jane

Going by the re-use of Christian names some of these children died in infancy.