The biggest thing people don't think about is alarming.

You can buy an AR15, but if you keep yoru front door unlocked everynight to where someone can walk right in and be on top of you while you sleep, you've already lost.

Lock those doors and windows, check em nightly. Especially with Kids, they open and change crap around way to much.

So many great points, I wanna reply more, but I am done with work and time to go into the main room and spend some time with my wife. (I work from home, so At least I got that working for me... Well, defense wise. Not HEALTH wise. Haha.)

Health, another major one. Make sure you're fit enough to clear your whole house without huffing away your position, if you have to.