Detroit to Niagara Falls via Canada, what to expect?

Check with CBS but that document from your wife re the kids may have to be notarized by a Notary Public/ Lawyer/legal beagle. Just a thought. May or not be an issue but worth checking into.......

When our daughter visits us in Arizona with our grandsons in the winter, she has a notarized letter stating our son in law is aware of the trip. She has been asked every time for the letter by both US and Canadian authorities.