“If the international student is born in Canada but is a US resident it is $37.000 Canadian.”
If the student was born in Canada, then they are a Canadian citizen. The total cost of attendance will be well below $30,000 in Canadian dollars. We have typically seen numbers around C$22,000, but quite a bit less than this for McGill. For a Canadian citizen who was born in the US but wants to go to McGill, you should check with them about the costs for a “Canadian born abroad”. I have heard that this might also apply to a Canadian who has been living in the US for a sufficiently long period of time (it would be worth checking). When we looked (about 3 or 4 years ago) the cost for a Canadian born abroad at McGill was the same as a resident of Quebec, which was quite low (total cost of everything well below C$20,000 per year).
My daughters are both dual citizens who were born in the US and lived their entire life in the US through high school, but applied to schools in Canada. Two of the schools in considering their applications missed the fact that they had Canadian citizenship and along with their acceptance also sent us information on how to apply for a student visa and on the cost for an international student studying in Canada. In both cases I contacted them and sent proof of Canadian citizenship, and they corrected the information to clarify that they would pay the same as a Canadian citizen (whether out of province or in-province depending upon the school, but there wasn’t enough of a difference for us to be concerned).