pra quem já pensou se seria possível trazer parentes pro Canadá depois de imigrar eis a resposta: é possivel sim e aqui vai o link:

Sponsoring your family
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Citizenship and Immigration Canada (CIC) knows it is important to help families who come from other countries to reunite in Canada. If you are a Canadian citizen or a permanent resident of Canada, you can sponsor your spouse, common-law partner, conjugal partner, dependent child (including adopted child) or other eligible relative (such as a parent or grandparent) to become a permanent resident.
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http://www.cic.gc.ca/english/immigrate/sponsor/index.asp
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When you arrive in Canada as a permanent resident, you must make every reasonable effort to provide for your own essential needs and those of your family.
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If you sponsor a relative to come to Canada as a permanent resident, you are responsible for supporting your relative financially when he or she arrives. As a sponsor, you must make sure your spouse or relative does not need to seek financial assistance from the government.
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The process to sponsor your family begins when you, as a citizen or permanent resident in Canada, apply to be a sponsor.