Hi, Search the 1921 Canada Census - that should show the name of the current owner of the land - at the time.
The Town / Municipality -
http://www.town.caledon.on.ca/en/index.asp should have land records - which will show the property - and any property transfers/ sales - to present day. - if they do not have the records - they may be in the town archive - -OR - they will be able to advise.
City Directories - eg Hendersons criss cross directory - name to address - address to name -
will show the name of the adult persons living at an address at the time.
Cheers, Stella