House doesn't matter. If you want to rent an apartment, some of them will ask 3-person family to rent two bedrooms, and some others don't care this. You can put your kid some where else and just say your couple will live in the apartment.
I heard that Canadian house owners usually do not allow 3 persons (a family with a very small child) to rent a one-bedroom-house. Is it true? Can anyone tell me how to do?