How does it work if someone living and working in Detroit and just cross the border to Windsor once a day and come back . are there any implications for residency obligations?
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Technically (and according to the definition), your working/living model would be counted towards the residency obligation. However, when you renew your PR card or apply for citizenship, the judge may not count this towards residency obligation. Because, you need to establish residency in Canada (in the sense that you need to live in Canada, and do things in Canada as you would normally do irrespective of where you live, eg. owning/renting a house, opening bank account, applying for health insurance card, etc.)