My in-laws will be spending six months here and on the return will visit Canada. When they leave Canada for India they might need to transit the US or stay 2-3 days at a connecting point. Relatives feel this is a bit risky as they would be re-entering the US after a long stay. Appears that there have been people who will just cross the border to Canada and come back for another 6 months.

Anything to worry about?