Best chainsaw for home defense?

So I'm looking for a home defense weapon and I narrowed my choices down to a chainsaw. I figured it's more threatening than a gun, and more forgiving, like if I was to apply it to an individual, I can control it more and don't have to worry about bullets ripping through my walls. So what's the best bar size? Should I get gas or an electric chainsaw? Also is there any ways of getting a safety put on it? I feel my kids and wife's health could be at stake if they mess with it. So I was thinking I could just leave the gas out of it, until I really need to use it on somebody lol