The genealogy and reference section of Library and Archives Canada (LAC) provides free service to researchers. Complete their "Ask Us a Genealogy Question" form using this link: http://www.bac-lac.gc.ca/eng/assistance-request-form/Pages/assistance-request-form.aspx?requesttype=1
LAC also has a searchable database of naturalization certificates up to 1951. The information you receive when you ask for a certificate may be very helpful in your genealogy research. Instructions on how to search
for a certificate and order copies are shown at http://www.bac-lac.gc.ca/eng/discover/immigration/citizenship-naturalization-records/naturalized-records-1915-1951/Pages/introduction.aspx
In addition, LAC holds an extensive collection of Canadian city directories. These contain alphabetical lists of the persons or businesses at an address in that city, the occupation of the head of the household, whether
they own or rent their home and possibly other information. You can ask the reference staff for a free lookup in these at https://www.bac-lac.gc.ca/eng/assistance-request-form/Pages/assistance-request-form.aspx?requesttype=3
Be sure to include identifying details such as names, dates, city or town name and addresses if you know them. Keep in mind, however, that LAC has limited resources and cannot do comprehensive searches for you.
if you would like to contact a professional researcher at LAC, we can recommend Hagit Hadaya who has an excellent knowledge of their collections. Hagit can be reached at firstname.lastname@example.org