the problem you'll have -- if any-- will be re-entering the states.the only problem entering canada would be if you could not prove that the kids are yours and you have permission to travel internationally with them.of course if both parents are with them then proving that they are yours should be the only task.
we're about 1/2 hour west of toronto, where are you going?
have a good trip!

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'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'86 tbirdturbo(gone)
'85 mustang gt(gone-but not forgotten)