Visitor visa..........I-94 extension

Anitha Kosanam

Registered Users (C)
My in-laws got 6 months visitor visa and they entered U.S. on Feb. 18th but the immigration officer at the port of entry gave I-94 for only 3 months(valid till May 18th). Do I need to send paper work for extension or can they go to Canada and while coming back, can they get the I-94 extended for another 3 months (which makes it valid till August 18th)?
Since they got their I-94 for only 3 months, is it OK to get it extended for another three months or will they have problems next time they appear for visitor visa? Any suggestions would be appreciated.
 
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