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I'm going to toss out from a momma bear's way of thinking in this scenario. You've been given good suggestions to implement already, but how about thinking outside the box with a dry chemical fire extinguisher.
5-10lbs would be sufficient enough. It will shoot a high stream of thick powder that can cover a larger area, even if more than one BG, and also the powder can slow them down enough for you and your family to get out or even potentially stop them altogether.
You get wider spray coverage than with pepper spray and you don't have to worry about your aim or what is beyond your target as with a firearm.
Just a thought for another layer of defense.
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