Please help-waiting online

I landed Canada and got maple card, I am principal applicant. But my wife and my son they are still in China, For some special reason, they can not land Canana before January 11,2007(visa expired date)
Can I do extension for them?
If they can not land Canada on time, any problem for principal applicant?
What should I do now?

Please recommend for me, appreciate

Many thanks

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