Perhaps the 1921 census will help when it eventually appears. Otherwise you are restricted by the privacy laws in Canada. There are no Central registries/indexes in Canada for BMDs. Canada has very strict privacy laws and each province imposes its own even further. Additionally, some provinces are more research friendly than others so researching in Canada can be challenging. The last available Canadian Census was 1911 apart from Manitoba, Saskatchewan and Alberta which was 1916 and 1921 being indexed at the moment and due soon............ (maybe) As a guide BMD Records are only available for births more than a 100 years ago, marriages 80 years ago and deaths 70 years ago. An Obituary for George Spencer may help if one could be found.
Sandra