Jessie Houston
Jessie Currie (April 1896 - ?) was the illegitimate daughter of one of the children of John Currie.
Parentage
She lived in Almonte, Ontario in 1911 and 1929, and lived as Mary Riddell's daughter. She is listed in the 1911 census, however, as their granddaughter, and the 1911 obituary of John Currie does not count her as among his daughters, despite mentioning her name.
Another child, Jessie, is listed in Grace's obituary as being her sibling, and in his wife Mary's as being her daughter. Jessie was likely born out of wedlock to one of John's children. The 1911 census lists her as a grandchild, born April 1896. At the time, Walter was married since 1893, but John would have been 17, Christena 15, and Mary 13. Christena is therefore the likeliest to be the true mother.
Marriage

On 11 November 1915 she married Alex Houston, a bricklayer.
Sources
Ontario, Canada, Marriages, 1826-1936 Record