Your wife does NOT have to work as long as she is in PR status. There is NO requirement PRs need to work. It's a common scenario for a stay-at-home parent to not have an income.Thank you for the information
Yes I understand what you mean but I want just to know if it's feasible that a house wife (not working) can fill the tax or not if yes what she will fill(no income) ? , otherwise is it mandatory to work 3 years if you want to apply for citizenship even for a wife with 2 kids(without husband).
If you are going to be supporting her with your income that is earned in another country, that's not a problem. If she is going to be living off of any savings, that's also not a problem.
If she earns any income herself from Canada, that needs to be reported.
You can check here for additional details:
https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/you-have-file-a-return.html
Even if she doesn't earn any income, it's better to file a return because the Canadian government and the provincial governments offer certain refundable tax credits such as for any children in the household, GST/HST. climate etc.
In that case, she will file a zero income return.
There are many newcomer services funded by the Canadian govenrment where your family can get help once they land in Canada:
https://ircc.canada.ca/english/newcomers/services/index.asp