It's crossing the border by land -- except for essential travel -- that has been banned since March, 2021. Except for flights from certain countries with Covid spikes, countries which have had temporary bans, flying into Canada has been possible throughout the Covid pandemic. Dual citizens, or a citizen of one country and permanent resident (immigrant) of the other have been able to drive across.
Flights from the USA have never been banned, but travelers must comply with strict quarantine and testing rules for 14-days. You can't fly to Canada and hang out with your friends here or have Canadian friends come by to visit you at your hotel for 14 days. (Now fewer days for fully vaccinated travelers, depending on Covid-test results before and after arrival. Their unvaccinated children still have to isolate the full 14 days.)
The rules get modified periodically. Here is the link to the official government site explaining the latest requirements, if you are planning to drive in:
https://travel.gc.ca/travel-covid/travel-restrictions/entering-canada-checklist?utm_campaign=gac-amc-covid-20-21&utm_source=driving-canada-checklist&utm_medium=redirect&utm_content=enI would not be surprised if there are long lines on both sides when the U.S.-Canada border fully opens. Even then, it's likely that the children of fully vaccinated adults will still have to isolate for 14 days upon arriving in Canada. Doesn't sound like much of a family vacation.
