There is an Isabet Christian born Saanich (Victoria) 1881 died Victoria 25 Aug 1913 dau of Paul Franck and Eliza Reid. Her death certificate does not show husband.
John Stanford Christian b San Francisco 21 Jun 1908 died Victoria 8 Jun 1958 son of John and Isobel Franck.
I can check for the obituary for John S and see if his siblings are mentioned. Gladys Maud's obituary may also show step children.