The Parable of the Skydivers
There were two men who went skydiving. They jumped from 12,000 feet -- one of them without a parachute.
As they fell free of the plane, he shouted to his companion, "Well? Tell me what I should do now!"
And his companion replied, "I really can't tell you what you should do now. But if you'd asked me ten seconds ago, I could have told you what you should not do."
The meaning of this parable is, if you wait until you've jumped before you look for a solution, it may be too late to find one.
Start BEFORE you buy or build a house -- and select a design where you can have a safe room that everyone can reach quickly. Rehearse gathering in the safe room. Be sure you can cover the approach to the safe room. Be sure there is alternate communications and exits.
Then gather in the safe room, prepare to defend it, and contact the security company or the police. Then sit tight.