About Financial support

[Jiki]

Hi, I'm eager to study masters in Canada. My parents are retired employees. I have enough solvency to carry on my education cost but my parents current income source is bank interest which is other bank account outside my academic cost. Now what kind of documents do I have to show as my parents current income source, as both of them are retired for last 7-8 years they don't have any income tax certificate for the last 7-8 years. Will it be okay if they give written statement and show bank statements as their current source of income?