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There are no legal grounds for you to sponsor them.
But if they are permitted to live here for five years they may be able to stay here on H and C grounds because uprooting the family after 5 years is not a great prospect for anyone.If one of them can apply as a skilled worker that would work best.
Here is a link to the information you should read or show them:http://www.cic.gc.ca/english/Immigrate/skilled/index.asp
The Quebec link is what more is needed over and above the eligibility requirements for the rest of Canada.
You can start here:
And read this as well:
If he can get a temporary work permit he won't have to leave.