OS
Lifer
The vast majority of burglars come right through the front door in broad daylight using something as simple as a crowbar. The rest tend to come through an open window or some other easy way in. Once inside they don't mess around and will turn the whole place over in a few minutes. One really loud alarm they can't easily turn off placed just about anywhere will do the trick.
A friend of mine works in home security and he recommends a shotgun with two triggers. If one shotgun shell won't stop them you've got another ready to use, but one is enough to just about blow a man's leg off. No skill required either, just aim in the general direction and try not to hurt yourself when it kicks. Especially with kids I'd think twice about buying anything small like a pistol.
that's terrible advice, like already mentioned, shotguns must still be aimed and shooting at someones extremeties is considered ineffective.
Once a firearm is involved in any sort of self defense, if the intruder is not already running away, you better be willing to use it to completely stop the threat or else the weapon might be taken away and used against you.