Thank you for your question.
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Gifts are not taxed in Canada.
So you don't need to report this gift.
Your parents do not have to pay tax in Canada (assuming they are not earning income of any sort from Canada) until they become residents in Canada.
Once they do then they need to report and pay tax on their income world-wide.
But they will not face double taxation because they will receive a foreign tax credit for any tax paid abroad.
Let me know if you need further clarification.