No problem for him to study in Canada. He can enter US to visit you using B2 visa. If the PD is current, he can use H-4 visa to enter US and file I-485 and apply for AP to travel to Canada to study.
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太感謝8老師了!這下放心了.
-qjwt-
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10/14/2014 postreply
18:48:11