...the father grabbed his gun. [More]Seems like the appropriate thing to do. Those of us who know we're not engaged in predatory criminal activities would have no reason to suspect anyone trying to forcefully get into our homes would be real law enforcers, or if they were that they would be acting lawfully, so the default would most probably be to repel them.
I'm not sure I'd be inclined to fire a warning shot, though...
[Via Ed M]