M means multi entries, so they should be fine coming back. No new date will be issued.
You do need Canadian visa for enterying Canada. It is not hard to get, but the most important evidence should be the evidence that they will leave Canada after short visit. If they has valid B2, that will be the evidence.
All above are my personal experience. Good luck!
回复:父母签证
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Usually Canadian consulate doesn't accept your application
-xiaobaitu-
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08/10/2006 postreply
09:32:45
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回复:Usually Canadian consulate doesn't accept your application
-doshexh-
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08/10/2006 postreply
11:14:14
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You'd better call them to confirm their policy before
-xiaobaitu-
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08/10/2006 postreply
12:35:27