We all have the same worry!
It depends a lot where are you going to to live in Canada, which province! I can tell you from my perspective (accountat here, experienced, 10 years in the job, currently working as Chief Accountant). We are planning to settle in Calgary, Alberta, I have been researching about cost of living a lot, since I have 2 small kids and need them to enroll in kindergarten also ehich is huge amount in monthly budget. Also we like to eat out a lot, go have fun in the city a lot, which means spending money on coffee, cakes, small bites, baloons for kids and etc, also we like to travel a lot and stay in nice hotels. For nice living, when I say nice, I mean comfortable, we need (household of 4, where kindergarten fees are around 3000 CAD monthly) including rent for house with backyard and leasing for 2 cars, with utilities, gas and shopping also, 9000 CAD monthly. This is 2 salaries for around 4500 nett a month, which is likely to find, a bit less in the begging, then we will need to be careful about spending but after year or 2 we can go back to our life style. So if you don't have expense for kindergarten and go with a smaller house or condo, you can easiy live with only 1 salary of around 4000 CAD monthly. Hope this helps!