I guess it will have to be a process of elimination, though to me it makes
sense to start with the most direct and simplest hypothesis, and then add
extra information as necessary. Possible sources include directories, census
(1911?), hospital records (Wellesley hospital?), business records of
liveries, passenger records, immigration or naturalization records. Is
anyone near enough to the Toronto library to gain access to those that
pertain to the immediate area?