Yes, you can return to China after you become a Canadian and stay with your family/child, your spouse(husband), your kids can then maintain PR status. The drawback will be that your spouse and kid could not visit you in Canada 3 years from now. ( 2 years out of 5 year rule ).
Anytime after 3 years, whenever your spouse wants to come to Canada, he must at least accompanied you (you are then Canadian) for 730 days to maintain his status. As for the child, I believe the rule is more relaxed ( that means the child's status is very much depend on his parent's status.)
Anytime after 3 years, whenever your spouse wants to come to Canada, he must at least accompanied you (you are then Canadian) for 730 days to maintain his status. As for the child, I believe the rule is more relaxed ( that means the child's status is very much depend on his parent's status.)