I would say that the most friendly, yet hardy chicken I know is the Chanticleer. They are perfect for Canada's winters and cold climate. The hens and rosters are very docile and would be very friendly to your daughters. They lay well during the winter. The only bad side to them that I know is that they're hard to find, other than that I would say this is the ideal breeds for any chicken person.
I also recommend Ameraucanas, They too are very docile (Honestly I can't think of a more docile breed). They are just (if not more) as cold hardy than the Chanticleer. they lay in the winter and the roosters are just as friendly as the hens. Ameraucanas aren't that hard to find compared to the Chanticleer.
I hope this helps, enjoy your future experience with chickens!
I also recommend Ameraucanas, They too are very docile (Honestly I can't think of a more docile breed). They are just (if not more) as cold hardy than the Chanticleer. they lay in the winter and the roosters are just as friendly as the hens. Ameraucanas aren't that hard to find compared to the Chanticleer.
I hope this helps, enjoy your future experience with chickens!