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There is a Gilbert Nicholls living in Vancouver South in 1949 - also at 2915 Forty Third Avenue (family home?!) with a Mrs W P Nicholls (must be Alice) and William Percy misspelt at W P Nicholas. 

Gilbert seems to be a Medical Technician and there is also another G Nichols, Machinist, living with them (wife of Gilbert or another brother or sister?)

Gilbert's middle initial seems to be "P" and his wife seems to be called Alexa J.  They lived at 2929 Forty Third Avenue in 1962 with Graham and Dorothy at 2915 Forty Third Avenue

I am returning to this thread Google brought to my attention, to inform that Gilbert Percy Nicholls in question had been married earlier, possibly in 1939 or 1940, so Alexa J is not his first spouse. Gilbert's marriage with Elmi Helen Teppo was a society event that caught attention in the press. Unfortunately BC marriage archives are open only until 1932 so far.