If you and your family possess a valid U.S visa that allows you entry into the U.S and a valid Canadian visa that allows back into Canada then you are golden.
Thats just my opinion. Now lets see what the seniors have to say.
I don't see why you can't come into the US and come back My two friends graduated in December 2017 and were able to come to Chicago with me in January without any problems.
Unless you are from one of the countries under u.s travel ban at the moment. The current development says that ban has been suspended by a judge. Not sure what will happen in the coming weeks.