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So the son is PR and not in Canada…if so how are they applying for a visitor visa. You are not eligible for a supervisa if visiting your children’s brother. So confused because your title is different from what you are asking.

If you are not visiting your children or grandchildren the answer is NO.
 
Can I write an explanation letter on behalf of my parents if I am acting as their representative?
 
@Naturgrl Sorry for a confusing post. My original intention is to know whether your parents can apply for a super visa when you hold a PR card, but not staying in Canada yet.
 
@Naturgrl Sorry for a confusing post. My original intention is to know whether your parents can apply for a super visa when you hold a PR card, but not staying in Canada yet.
Where does PR live? So the person who is PR is not a resident for tax purposes? How does the PR meet LICO then with NOA?
 
Sorry can you expand LICO and NOA please? Not familiar with those terms
The PR, living in Canada, will know the terms. NOA is assessment of income on your CRA tax filings. NOA will show if you meet LICO (low income cut off) to apply for supervisa based on the number of people in your family. How many is in the PR’s family including PR, spouse, children and parents. Then read NOA and see if it meets LICO. LICO is on the supervisa site.

Who is PR and tax resident of Canada?