Agree above. If you are working at someone elses house then you are a nanny and you will be paid by hourly rate. I wouldn't know how much you will get as it depends on the city, area you live in. I don't know how things are in Canada as I never worked as a nanny here but in Europe if you bring your own kids to work, you will be paid less.

And also here families are expecting a lot! from their nannies. Like cooking for the whole family, cleaning the whole house etc. It's more like a housekeeper/nanny. You should talk to them everything in details to avoid future misunderstandings!

Good luck with whatever you decide.