I live in an area where I do not even consider the possibility of a break in. I don't know where all you people live. But honestly when was the last family murdered in your neighborhood? With 50,000+ members on this site I would guess less than ten have had someone killed on their street. Unless it is one of the few hotspots that do exist in a small handfull of cities.
That said if someone came into my house and started to threaten or actually injure or kill my family members I wouldn't hesitate a moment to dispatch the assaliant with the most appropriate tool available. I would probably either take my old side by side with some buck. Or my cz 9mm or whatever was handy.
The thing to remember if you shoot an invader is to state and continue to state. "I feared for my life.". Because the charter allows you to use appropriate force. Yes the intial hassle after the shooting will suck big time and your guns will probably be seized and you may spend some time in jail until it gets to court but once you are there and you get your chance to say I feared for my life and the lives of my family and I shot the intruder because she was trying to kill my wife/daughter/son and me. I don't think you will be convicted by your peers. Though you will still probably get screwed because this is
Canada. You might lose your guns perhaps even permently but at least you and your family are still alive and perhaps your case will set a precedent so the rest of us aren't so f'ed over.