<------ Formerly taught marksmanship and close-combat tactics while in the Army. Additionally, I've owned a Colt AR-15 HB for years and could not, with a clear conscience, recommend either it or any other assault rifle for defense inside the home. Yeah, okay, my instructor days were back during the late-90s, but still.
Go with a shotgun. Your kids and/or neighbors will thank you for it.
This is excellent advice. Like I mentioned my wife has a .20 gauge Coach double barrel shotgun. This is only one of many rifles, shotguns and hand guns we have but this is the one she keeps loaded and at the ready at all times. (our children are grown and when the grandchildren visit we are safe and responsible). The coach is for home defense only. It is very light weight and in a close situation it is extremely effective. The main thing to keep in mind is make sure your wife or daughter understand how to use a weapon and are familiar with it. If they have fears work with them to over come these. Bottom line stay prepared and have the ability to defend yourself. Unless you sleep in a police station or the local armory you need protection and 911 should be called, but only after you take care of business. If someone violates your property and enters your home uninvited, do what you need to do and don't hesitate. The law is on your side and it is much better to be safe than sorry. All the tears in the world will not bring back a loved one, once they cross over the river so to speak.