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<p>I don’t know for certain, and I’ve wondered that myself. The McGill website isn’t perfectly clear on the question, but at one point I came across the following:</p>
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<p>[Fees</a> by residency status | Student Accounts - McGill University](<a href=“http://www.mcgill.ca/student-accounts/tuition-fees/general-information/fees-residency]Fees”>http://www.mcgill.ca/student-accounts/tuition-fees/general-information/fees-residency)</p>
<p>That seems to imply that a Canadian citizen residing anywhere–even Michigan!–would be eligible for the “non-Quebec Canadian” rate, so long as they can provide proof of Canadian citizenship, for which a passport should suffice. The University of Toronto uses similar language in discussing its “domestic” tuition rate.</p>
<p>If that’s the case, McGill’s a pretty good deal for your family, but you should probably check with McGill to verify this.</p>