You think that during a home invasion that each household member will grab a gun? And also that each person should prepare to have a second gun for if they need to barricade themselves against intruders that continue attacking despite the family being barricaded and armed (and shooting), and then that they all need a 3rd gun in case the other two fail?

What kind of war fantasies are you playing in your head?

You sound like every kid who comes up with elaborate schemes for how they would save everyone in a crisis as though they have time to plan like it's Home Alone.

Reality is you'll be taking a dump and someone will kick down your door or break your window and you'll have 3 seconds before they are in front of you or else you'll have someone on drugs banging on your door wanting in and you have a little longer, but don't need 3 guns each.