So, it is possible that some one goes back to China, and comes back to Canada by driving a car through U.S. Thus to hide the fact that he in fact he is not staying in Canada. Of course, it is not so easy to do like that, but it is possible because I know some one who has done like that ( dangerous ).
If u is eligible to have NCBS (national child benefit supplement) so-call"牛奶金", does not matter Ur child (under18) stay inside or outside Canada, so I don’t think that is a right example for this topic.