Mary Stewart Ainslie was born circa 1830 in Scotland, United Kingdom to James Ainslie (1808-1860) and Mary Steven (1808-1887) and died 1925 Hobart, Tasmania, Australia of unspecified causes. She married Edwin Cox (c1825-1894) 19 January 1856 Argyle St in Hobart, Tasmania, Australia.
She arrived in Hobart, Tasmania on 10 January 1853 on the Louisa with her parents and siblings.
Children
| Name | Birth | Death | Joined with |
| Mary Johanna Hadden Cox (1854-1931) | 23 February 1854 Hobart, Tasmania, Australia | 23 June 1931 Wollongong, New South Wales, Australia | Charles Page (1851-1919) |
| Name | Birth | Death | Joined with |
| Edwin James Cox (1857-1907) | 5 February 1857 Hobart, Tasmania, Australia | 6 May 1907 Grafton, New South Wales, Australia | Mary Jane Baker (1858-1922) |
| (male) Cox (1859-1859) | |||
| Rodger S Cox (c1859-1918) | |||
| George Clarence Cox (1861-1935) | 1861 Grafton, New South Wales, Australia | 1935 St Peters, New South Wales, Australia | Clara Isabel Page (1869-1953) |
| Emma Jane Cox (1862-c1937) | 1862 Grafton, New South Wales, Australia | 1937 Murwillumbah, New South Wales, Australia | Charles Stewart Connor (1865-1896) Albert Parry (1853-1936) |
| Emily H Cox (1864-1865) | |||
| Fanny M Cox (1865-?) | |||
| John William Cox (1867-1953) | |||