I'm going through this as well. I know you love your wife, but I agree with the people that say you will regret it if you cave to her. Your kids need you to be guided by what is in their best interest right now. I'm not sure exactly how the system works there in Canada - but I presume the mediator is there to help you be reasonable with one another. Utilize that.
Good luck- it will be a tough day - but you will get through it.
