As Joanna said, Ancestry's "Canada, Immigrants Approved in Orders in Council, 1929-1960" collection contains the names of twenty thousand sponsors and sixty thousand immigrants 1930-1960. It's a rich source of genealogical information for this period, and unusual for Canada, relatively recent information. If your family sponsored a family to come to Canada, you too might find their records here.

It's surprising to see how much hand's on work the Privy Council did with regards the lives of ordinary Canadians. Exploring OIC records has given me insights into the thinking of the men at the centre of power: how laws are formulated and how they are managed. It's the paperwork that creates unintended genealogical records. I have a passion for exploring Chinese Canadian history but OIC records included a wide swath of the population, from Armenians to Yugoslavians.