(1) If you live in Quebec and you have children, they must go to French schools unless you graduated from English schools in CANADA.
In Ontario, people have a freedom of studying in regular English, French immersion or regular French schools.
(2) For the tax return, you need to file 2 returns. 1 for Canada and 1 for Quebec.
In Ontario, 1 tax return only.
(3) (funny experience.. Just for laugh only.) Car rental companies in USA may not understand/read the information from the Quebec driver license because it is written in French. I was asked my date of birth, although the information was written in the driver license already.
How much is the difference of the housing price in Gatineau, Quebec from Ottawa, Ontario? When you do the math, consider the higher income tax rate, lower day care fee, and the traffic on the bridges if you work in Ottawa as well.