You will remain a resident for tax purposes just in case you didn't realize.
This is NOT necessarily the case. In many situations a PR residing abroad for the tax year can file a non-resident tax return or even not be required to file a return at all. Depends on a number of details. See CRA information for more detailed description of who is a resident for tax purposes and otherwise who must file a tax return as a non-resident.
In general (very generally):
Residence of family in Canada is of course a very significant factor in evaluating tax/residential ties, but it is NOT a definitive factor.
And especially if the PR is a bona fide resident for tax purposes in a country with which Canada has a treaty (which applies to a large number of countries), that usually (not always) means the PR is NOT a resident of Canada for tax purposes.
While
who-is-a-Canadian-resident for tax purposes, and
who-must-file-a-Canadian-return, are related questions, the respective answers depend on a range of factors, many of which are not definitive. Some are. Canadian sourced income or otherwise having a Canadian tax obligation definitively require the filing of a return . . . but whether that is a resident return or a non-resident return depends on other factors.
And
WHO-SHOULD-FILE-A-RETURN is also an important question, even if the PR might otherwise NOT be required to file any return. If, for example, the spouse living in Canada wants to qualify for certain benefits or credits, they may not be available unless the spouse living outside Canada also files a return. But here again, whether the spouse outside Canada needs to file a resident return or a non-resident return depends on additional factors.