As an American new to Alberta you seem to have missed the 40 years of Tory mismanagement that preceded Ms. Notley. So you will have to forgive my scepticism over a personal politically edged comment. You have also failed to calculate the increased US health costs your children will pay. Please add that to your US tax rate per annum per person. I'm guessing that would change the financial merits. For most Northern states and California the marginal tax rate is similar to Alberta. 
Anyway if you and your children left because of political inconvenience or discomfort then please  take care and thanks for visiting. You should certainly have fun with the incompetent, racist circus that is the Repiblicans and Trump. Cheers